You need to use some common sense here. Anyone with half a brain can see that how the video is transmitted to the STBs has jack squat to do with how video is transmitted to an iPad or phone. The UI and features part of it is also complete BS, in fact Comcast has proven that wrong, since they have used X1 to do exactly what Verizon is saying IPTV will do, but right now, X1 is using QAM, not IPTV to get video delivered to it. That's a function of the box's software and architecture, and has nothing to do with the transmission method to the box. I am not, but rather a TiVo enthusiast like most of the people on this board.
I'm not saying that Verizon's reasons to want to move to IPTV aren't legitimate. There are some significant advantages, like unlimited channel capacity, potentially better picture quality, faster channel changes, etc, etc. However, the bullet points they have outlined are pure marketing speak BS, and have a very limited relation to reality at best. The interface, UX, software updates and the like are a function of the box, not of the delivery method. The new IPTV boxes will probably do all that better than VMS does, but that's just because they are a new generation of boxes, not because they use IPTV. Verizon could just as easily have made a new generation of QAM-based boxes that do all those great things, or re-engineered the software on VMS to do all those great things than moving to IPTV. Verizon's reasons probably ultimately have to do with cost, and maybe delivery of 4k content or other factors.
Eh, I don't know. Having a common IP-based platform for all of a company's video services, that can serve a range of devices -- maybe that's marketing BS but I don't tend to think so. It seems plausible to me that there are efficiencies (and therefore cost savings) to be gained the more integrated a tech company's operations are -- the more their various service streams operate using common or similar server and network hardware and software, based on common protocols. Such a platform should be more scalable and flexible, with less complexity than a system composed of a patchwork of different sub-systems dedicated to different delivery methods for different devices. (If anyone has any links to technical discussions on that point, it would be an interesting read.)
Isn't that pretty much true of Netflix (the video behemoth that just surpassed all of cable TV in terms of US subs)? Don't they have a common IP platform for serving all types of devices, from phones to smart TVs and everything else? To some extent, I think Verizon, Comcast and other major MSOs feel like they need to play catch-up with Netflix in terms of technology, and that's part of the drive towards IPTV and the idea of a unified platform for all devices.
All that said, let's set aside mobile devices and just focus on TV STBs. Contrary to your assertion that video over 5G has nothing to do with FiOS's new IPTV system, I disagree -- we can't know for sure, but it seems to me like it could very much be a factor. As Verizon has been developing their next generation of FiOS STBs, UIs and the backend system architecture that would power them, let's say that they were considering whether to make the platform IPTV except for linear channels, which would remain QAM (much like Comcast's X1 right now and the existing FiOS TV service), or whether to make it 100% IPTV, including linear channels. Don't you think it would be a major point in favor of 100% IPTV if Verizon was planning to roll out home internet and TV service to new areas using a 5G (hybrid fiber/millimeter wave wireless) connection as opposed to all fiber to the home (FTTH)? I say this because I don't think it's possible (or, at least, hasn't been engineered) for QAM video to be transmitted over millimeter wave wireless connections. (I'm only aware of it being transmitted via fiber and coax wired connections.) But IP video is no problem for millimeter wave wireless. So why not invest the resources into a 100% IPTV system for next-gen FiOS TV, since that investment could be expanded/repurposed to serve those new homes connected via 5G? Verizon could use the same STBs, powered by the same backend servers, to deliver this new IPTV service to homes regardless of whether the video travels all the way to the home over fiber or over fiber to a neighborhood node, where it then gets beamed wirelessly for the last jump to the home. (Similarly, AT&T uses
the same Uverse IPTV system for both their new AT&T Fiber, i.e. FTTH, customers as for their original AT&T Uverse, i.e. hybrid fiber/DSL, customers. They're just different types of IP paths to the customer -- why have different platforms for serving them?)
That's the beauty of an all-IP system. IP video can flow over all sorts of connections, both wired (coax, fiber, ethernet) and wireless (LTE, 5G millimeter wave, wifi). Whatever new paths that are devised for reaching consumers going forward, you can be that they'll be IP-based. So why not make your video delivery system completely compatible with that standard?