Heck.It’s not even just the shifts in classes and races.
I keep saying the Martial/Caster divide exist because the idea of what a high level wizard is shared amongst the community but each table, city, and design group has a different idea of what a high level fighter is.
We all agree on the Archmage and High Patriarch. But the void creates 20 concepts of the Grandmaster Swordman and Prince of Thieves.
And as time marches on, more ideas of the level 18 fighter/barbarian/rogue/ranger/etc are created.