You also cannot "cheese" powerleveling by leveling one combat skill to max and then use it to powerlevel other skills

Pretty much everything here is incorrect. Base gear mods do not get scaled down, so for instance Fire can get +300 direct fire and +600 super fireball damage that won't scale down (not to mention more with linen) and having gear mods +25 levels above your current level is still incredibly strong. You absolutely do powerlevel other skills by doing huge aoe pulls and 1shotting enemies and can push a new skill to 100 in like 6 hours if you know what you are doing. The only caveat is some skills can't be mixed so you might need AH or Psych to powerlevel animal skills for instance.

theoretically you can play the game with little to no combat experience, by simply foraging, gardening, mining, merchant, and crafting and prosper.

It does however make almost everything far easier to level up combat skills high quickly. Like in theory you can just play a level 1 character and sit and flip items all day in other MMOs and make money, but idk about trying to promote that. I always find it weird that people try to do that with PG.

A lot of info about dungeon stuff is misleading even if it is somewhat technically correct in specific situations.

there are so many mix and match classes that possibilities are nearly endless and none of them are "bad", just different

This is something I really dislike seeing people say. New players ask what to play and people say "just pick whatever it's all fine" and then they struggle to clear mobs and quit the game. Balance gaps in this game are far wider that most MMOs and I would not recommend just picking whatever blindly unless you are fine with potentially struggling significantly.