I don't understand this reasoning. You describe two choices:
1. Buy a RokuTV. Eventually, a few years from now when you want a better streamer, buy a standalone Roku and connect it to the TV.
2. Buy a non-Roku TV and a standalone Roku player. A few years from now, buy a new standalone Roku and replace the old one.
Why is #2 better than #1, especially when it most likely costs more, and never provides the input integration of the RokuTV?
I really like the RokuTV and on this point I mostly agree. In fact I kept my 55" TCL after purchasing a replacement because I like it so much. Here's the thing...
If you have an AV Receiver and surround sound, the input integration is a pain in the ass. It doesn't have any way to differentiate the input from your AV receiver and thus change the picture settings accordingly. Other televisions do. This is my biggest pet peeve with the set. I don't want to go switching picture modes every time I watch a Blu or use my HTPC, but I don't want to compromise my sound (by passing it through the television set, which doesn't pass it on untouched even through ARC) to circumvent this. Aside from that, if the set didn't come so very close to being well adjusted as far as picture is concerned (luckily my TCL does), the advanced picture settings are weak and need to be tweaked to include more features. You have simplified things well with the set, and I love it for that, but the techie in me wants a way to switch into "expert" mode and fine tune things that would make it that much better. I believe both of these problems are firmware issues, but will they ever be addressed? You don't need license to pass audio untouched over an hdmi ARC from any input, there is no good reason to down-convert it, at least that I'm aware of, possible hardware limitation?
In any case, there are valid arguments for both choices. I find the RokuTV is great for people who don't care to fiddle with stuff too much and want decent picture quality and awesome ease of use and input integration. Other sets are viable for people who really want to get the most from their television at the cost of user convenience.
I'll be keeping my RokuTV in the bedroom, where I'm not nearly as concerned about fine tuning. I love it for what it excels at, and the compromise for the price is not at all unfair...but a couple little features in calibration and audio handling would push it right over the top into "no brainer" territory.
The critics are too harsh on the picture IMO as well. It has nice contrast for the price bracket, excellent off angle viewing, decent motion handling, and color accuracy could be far worse. It beats my 2 year old LG 47" LCD that had excellent reviews, in almost every aspect (except the mentioned flaws, and color accuracy). That set was closer to $1000. But the market has changed...