What is a better way? Without Concentration, you could enable some very busted combos from casters. Many people already argue casters are already overpowered even WITH Concentration, so to imagine a system without this is strange to me.
You just don't need to have uniform rule for all spells in video game you can balance them on case by case bases because everything is handled behind the wall by cpu automatically and it deosn't bother players in anyway shape or form like you would in table top with gazillion charts and checks... anyway it's fine for what it is, some spell will just see little or no use because of it, no biggy. Still planty left that good and are broken op even with Concentration.:)
