They have meaning if they permit you different activities, or restrict others, or if they simply let you express your character is different ways.
Merely advancing through the game isn't the only possible gameplay objective. Trying to win isn't the only way to play. I'm often not at all interested in winning the game, and sometimes failing to win the game is a satisfying outcome for me (my favourite Warden in DAO didn't live to see the Landsmeet - Sten killed him long before).
But my point here is that twitch mechanics or fast-paced real-time gameplay isn't something I'm willing to tolerate, so no game that forces me to play that way is acceptable to me. No Dark Souls Dragon's Dogma or The Witcher for me, because I think action combat has no place in a roleplaying game.
I'm looking only for the ability to roleplay, even in combat, and a pausable stat-based combat system does that for me, regardless of whether the stat allocations have anything to do with my chance of success (though they almost always do).
Furthermore, what you claim is true of Wasteland 2 is only true if it's literally impossible to gimp your characters. And I happen to know that it is possible to gimp your characters, because I have done it.
It actually is pretty much is impossible to gimp your characters, wherever you put your initial and growth stats they should advantage something or other, even if you are a pure CHA character or something you'll get followers that aren't and can handle a gun. I mean, you can't put 1 in every category, even if you wanted to, so I don't really see it. It also doesn't matter what guns you spec in because for example assault rifles have armor penetration which makes them basically like energy weapons, or there are pistols that as powerful as most rifles, or strength based weapons that are as powerful as grenades. Everything was normalized.
In Fallout 2 at least you could put all your points in agility and none in perception or something and basically be completely screwed, or have no one spec energy weapons for trying to kill robots late in game.
I honestly didn't understand your "permit your different activities" comment.
Even if you were a fan of stats I don't see how you can hold DA2 or I as examples of good stat building, did DA2 even have stats? I honestly don't remember any, I just remember spamming attack or heal.
I mean WoW was the model for DA2 basically and even WoW barely has stats anymore, they converted their MMO hotkey design into something approximating a heavy action game (like the Souls seris) which is probably more stat heavy than DA otherwise.
Actually, you want to gimp your character? Play Demon Souls, screwing up stats or builds in that game can be nightmare, it's meaningless in pretty much every game you cited.
TW isn't like an icon to gameplay but at least the basic dodge and flank and things require a certain amount of attention that I find consistently more challenging than a neverending parade of numbers.