To the OP, as someone else from "back in the Jjjerm days"
Yeah, a lot has changed. Some good, some bad, but there is far, FAR more of an emphasis on mechanics and build prowress than there was back then.
Has this impacted the roleplay? Somewhat. I feel like it simultaneously amplified and nullified a lot of the issues from back in the day, when you'd have 1 or 2 extremely powerful people stomping all over everyone. It brought that tendancy out in EVERYONE, so now everyone is sort of...kinda avoiding that? Its really hard to put it into words. Its like "everyone is special so now no one is, but GODS HELP YOU if you aren't special like us"?
The biggest impact this has had isn't with pvp; thats still pretty easy to avoid unless you write yourself into a corner if you want to avoid it. PVE is where this is most noticable and I hate it. As someone that prefered solo exploring with semi-limited playtime, the jump in PVE power is incredibly signficiant and if you don't want to die as early as midlevel areas, you MUST adhere to some of the new "build standards". I'm personally saddened by "If you don't have 50 AB/60 AC/ESF Discipline you're useless", but i've noticed as early as level 19 I cannot travel in level-appropriate areas alone unless im' willing to conform to "build standards".
I've personally always hated the "lol, get gud " or "big party always required" arguments so I won't go further into that. I know i'm not the best builder/player, but i'm not bad either. Right now though, the server content seems to cater to the extremes of either end, whereas 15 years ago or so (damn, its been a long time) areas were more accessible for a wide variety of players regardless of skill or build quality.
This had, very slightly, in turn, affected the way players tend to tell stories with their characters. Some of the more memorable characters had weird and unusual builds, but were built in a way to tell a story rather than show numbers on a sheet. Don't get me wrong, there are absolutely people that still do this, but I doubt you'll see something like Nalee Darin with a druid/rogue build anytime soon. Or a shifter; why waste my award on a shifter with its crappy shapes (more or less unchanged from default nwn) when I could be a half giant weaponmaster with a colossal sword instead?!
Certain builds, or just straight up classes aren't commonly played simply because there is something newer and shinier that does what the old model did and then some. Wizards and sorcerers were, and to some extent, are, stuck in this rut, compared to newer classes like hemomancers, elementalists, etc. Gods forbid you want to play something like a harper/zhent scout, which eats 2-3 feats on useless feats for questionable benefits.
To be clear with that last paragraph, i'm not attacking anyone or trying to criticize. I'm just pointing out the way people use their characters to tell stories has very much changed since "Ye Olden Days". I wouldn't go far as to say "build first, story second", but I'm definitely not seeing as many people willingly gimp themselves anymore to create an interesting character.