Not really if you think about it from their point of view... I think some call it marketing, And Apple is pretty **** good at that according to their stock and wealth I'd say...
Good grief, I guess I never realized that tap to wake was considered a major feature that Apple marketed...I don't recall seeing anything about that on their website about the 11 as something they highlight. To me, it just seems like a baseline feature in 2020. Like I mentioned, my bottom-of-the-line aluminum Apple Watch has tap to wake. Wouldn't it seem ridiculous to limit that feature to the stainless steel models? Well, same logic applies to the iPhone, imo.
Like I said, it's not a deal breaker and definitely not something I'd base my iPhone selection on and I doubt many others would (thus I don't buy the "marketing" angle), but it just seems really petty for them to do that for what I consider a very minor (yet very convenient) feature. Face ID, cameras, screen, etc. are on a totally different level of "feature" that involves exclusive hardware, not just a software setting.
Whatever. Rant over. Carry on.
EDIT: just saw your 2nd post:
BTW: I'm not an iPhone user, but what's the difference if one can just wake the iPhone SE just by pressing its Home button???
Because it's easier to lightly tap anywhere on the screen than deliberately pressing the "button." Same argument could be made for raise-to-wake (which the SE does have, making the lack ot tap to wake even more puzzling). If they weren't useful features, they wouldn't exist.