In Solasta (where the system as a whole was well-implemented) I think concentration works well and I like it just fine. Of course the system was made with tabletop in mind. Its a tabletop system. Rebalanced spells for a video game and you have to rebalanced everything else, at which point just make a whole new system. But plenty of people are coming because they want to play 5e. The system isn't perfect, but no system is. Its good and fun and would be doing its job if Larian hadn't mucked with it the way they already have. Suggesting wholesale changes like this kind of misses the spirit of adapting the system.
When will people realize that a single player VIDEO game can't be like a TT game probaly never will be.
So maybe we should stop trying to make it into one.
If people want to play DNd 5e they can just go do that... Stop pretending that this is it, because it's not. Far from it and it should not try to be one.
VIdeo rpgs and TT Rpgs have vastly different strengths and weakness and as such IF you gonna adapt a system from one to the other you should do that. Adapt it, meaning change it for the new platform! Not copy paste it.
But yes that would indeed need a new rebalance. Thing is, game needs one as is so not really a big deal in the end.
Anyway, way to late for this kinds of changes gonna be lucky if they can finish in time as is.