I don't think I'd personally have much issue with wonders taking a hex if it weren't for the fact that most of them have absurd placement requirements. The wonder section of the build screen usually ends up consisting of:
- ~5-20 wonders that you can't build because of some wacky requirement like "must be built adjacent to cattle and a commercial hub with a market"
- ~1-2 wonders that could be good but can only be placed on some valuable tile
- ~1-2 wonders that aren't good but can actually be built somewhere you'd want to
(the wonders that don't fit into the above have been built or are being built, of course)
So many wonders just go unclaimed by the end of the game because it seems like every one of them is stuck with some requirement like this. "Is sacrificing this tile for this buff worth it?" could potentially be an interesting decision, but I'm not making that decision when it's so restrictive that I can't even build it (or the answer is obviously no). And while I
could look upon the virgin lands on turn 12 and decide a place that would be good for broadway, I don't want to learn the encyclopedic knowledge required or to use time searching to remember that it requires a flat tile. Some requirements make full sense to me (petra requiring desert for example, believe this was in 5 too), some I personally find annoying but I acknowledge is personal preference (adjacent to [district] usually), but some I just ask
why? Why does Országház require a river, but not a city center like the Forbidden City? Why does the Statue of Zeus require flat land? Why do the Colosseum and Broadway require flat land too? etc. It feels like their goal wasn't for the requirement to make building it more engaging, but rather for it to more closely match it's placement in real life.