Removing level cap could be the answer but we'd get ubermensch. Players aren't meant to be all-universal or spend most of their time in levelling.
We can have all skills on max righ now, but for this you need to fast relog, everything they suggest is to make it possible without relogging, so you can stay on the same character.
And of couse, making universal player must be much more difficult than make combat alt+crafter of X alt+crafter of Y alt+doc+bomber+...
Just make only tagged skills possible to up higher than on 150%, others skills shouldn't get higher.
Returning XP diminishing will remove grinding on the same mobs whole life from 1st to max level, also implementing the same system for crafting (crafting the same item gives less and less XP) will make it more difficult too.
It's now so easy to get billion XP mostly 'cause if kills, critters' death shouldn't be the only way to get XP, because after XP diminishing was disabled it's the only way to obtain XP, yes, of couse you can use crafting to lvl, but... may be only on first levels and if you're 1 CH and don't have mentats to make quests at begin to get like 4th or 5th level without crafting or shooting/punching anyone, anything else is grinding on one type of mobs whole time to get 21st level. Don't need implement other source of XP, simply nerf XP for killing and give
every character all ways avaible to get XP. Powerbuild can't do anything except for killing, if your character can be, as you want to call, ubermensch, it'll change only one - you don't need to fast relog on your other character, because you can do that yourself. And please, don't say "It'll kill communication, everyone become selfish", hahaha, even now, look at gang, almost every member has his own armor crafter, there're alot SGBGEW crafters, some docs, people still have thier own crafters, even if I myself don't have any crafting alt except for doc (whom I don't use), I still don't see any problems. And it's really easy to get your own crafter, just make 10 IN + skilled + SPECIAL stats required for your prof, few levels on quests/grinding on mobs and you can craft whatever you need. Making players specialized on something here is useless, they still being universal, but they need to relog for this, not much will be changed if we'll be universal, but more interest to play and always have an aim for something.