That's the charm of the new system, there are several options that have pros and cons and you can actually choose between a few that no one will objectively call outright bad.
The most clear example of this would the the domination three though......dark harvest, predator and electrolute are all great options on most champs that use such a page.
Sorcery is more limited with few taking phase rush but people still switch between aery and comet.
Precision and resolve are probably the worst tree's in terms of how good the keystones are compared to each other, precision due to how lethal tempo is so easy to punish and how strong press the attack is.
And how few the fleet fotwork users are x)
Resolve due to how subpar all the keystones except aftershock are, unless we're talking like 40-50+ lategame.
But even with at least 2 options and a lot of side choices people still know what's the best most of the time.
At least in my gold/plati lvl elo, and my "high" silver friends told me the same thing.
They all knew what to use without me telling them.