They've (As in the entire electronics industry) have always made things thinner and smaller, why is there such gripe over this current level of thinness? Give it 10 years, and you'd think it was a brick compared to what will exist by then. No, nobody was complaining of the thickness before, but then again no one complained over the previous generation either. Making it lighter, thinner, smaller, is always the primary goal of any portable notebook computer, as they're designed to be portable. So anything that increases that goal is generally considered a win.
I don't believe the current one's are too thin, I think they've done a pretty amazing job of engineering something that powerful, whilst still shaving pretty considerable dimensions from the previous generation. There will always be certain issues in doing this, every mass produced product tends to suffer a single point of failure, this time seems to be the keyboard. But the alternative to all this is just to stick with the previous design, and then a lot of the same complainers just bemoan a lack of innovation. Would you really, honestly, not be on here screaming "I'm not buying an 8 year old design, Apple have lost all innovation under TC!" as I find it hard to believe.
Compromises are just that, sometimes they work out, sometimes they don't. But remember they target the masses, not the few. If you, or a group of people on a forum don't like something, remember there will be millions of others who enjoy it. So you can enjoy it with them or move on, or "Wait until 20XX...". Nostalgia is also a huge problem, people seem to feel the 2016+ design is the only time Apple have every released anything with a flaw; in truth all manufacturers do this, however Apple sell such high volume and receive such high coverage on any issues due to this.
Or ya know, start hundreds of threads to call out flaws, and go round in giant like-minded circles till the next generation.
I dunno, we're all allowed to rant I guess, these are the MacRanting forums after all!