Oof. I was hoping people were misunderstanding and getting disappointed for nothing, but that's genuinely disappointing. When the whole selling point of your extremely expensive device is that it's higher-quality than disc, a little asterisk saying "as long as you like the biggest blockbusters and not anything more niche or interesting" is an ugly asterisk.
It's not accurate to characterize this as "only the biggest blockbusters" by any means. For example, the three titles that Broncowrangler cited just above all perform well enough to have 4K Cinematic versions.
Anyway, I'm not sure continuing this discussion is productive at this point. We've certainly heard all of the feedback, and I'm sure that things will evolve over time. Right now, what I've described above is the policy for the immediate future.