I agree. TiVo has a history of leaving backdoor features alone that are only known by "in-the-know" power users (like 30-sec skip). I believe the reasons the Mini is tied to a 4-tuner TiVo are 1) fear of support costs and 2) fear of not meeting user expectations: TiVo wants to ensure MOCA is available (to discourage streaming over WiFi) and wants to minimize the disruption of stealing a tuner for live TV. In particular, I don't believe their primary motivation is to encourage folks to upgrade to a 4-tuner host; if that were the case why not just delay the Mini and have it only work with the next gen TiVo HW shipping in the fall? For power users who understand the limitations of using a 2-tuner TiVo, I don't think TiVo would actively block their use by closing such a loophole. It's not worth their time, and they gain almost nothing from ticking off their power users.