I wish mages felt like in bg2 though, here they are just support chars, buffing and debuffing
Why, can't you - once you hit level 5 - start fireballing everything in sight if you are inclined to do so? You might not be able to obliterate everything as easily as in BG2 but let's be honest, BG2 except for a few encounters, was an easy game. And remember, you started the game in BG2 already at level ~7 iirc. In BG1 mages supposedly died when a kobold farted in their direction, compare P:K at low levels with that.
When D&D transitioned from 2nd to 3rd editions, HPs basically doubled. Dealing direct damage as a wizard post 2nd edition is a very sub-optimal strategy. Saving throws were also changed, and feats granting significant advantages to avoid spell effects (evasion, slippery mind, etc.) took a lot of wind of the wizard's sails. IMO, the 2nd edition mixture of spells was also a bit kinder to mages. We no longer get Horror as a Level 2 spell, for example. Many defensive spells also got majorly nerfed between 2nd and 3rd.
Quite true, and then HP increased again with the jump to Pathfinder. Wizards/Sorcs now use D6s instead of D4s for hitpoints, Rogues/Bards D8s instead of D6s, Rangers D10s instead of D8s. Then you also get the option of +1 hitpoint per level in your favored class (which is not in the game afaik). Then there's th
e Toughness feat that now gives +1HP/lvl instead of a flat +3HP. Finally you have to account for +2 to any stat for Humans (among others) which can lead to more points available to put into constitution.
Some Monsters got the same (or even better) treatment, with Monstrous Humanoids and Outsiders seeing an increase from D8 to D10. Undead dropped down to D8 but get their charisma added to hit points (basically free unholy toughness for everyone) which leads to more HP in nearly all cases. Furthermore a couple of monsters simply got additional hit die or constitution points added on top of everything else without changing their CR, plus the change to the Toughness feat is particularly noteworthy since it's a popular choice for many creatures. All in all the biggest "offenders" are high level Outsiders that often benefit from all of the above, but the single biggest asshole is probably the CR10 Rakshasa that went from 52 to
112 hit points because fuck you, that's just what they needed on top of 25 spell resistance and their moronic 15/good
and piercing damage reduction.