Larian, please hold fast and don't implement the boring click-a-thon 'I win' Bless spell. The game is already easy-as.
but, it won't get any easier with better bless. It will just be less tedious.
And again, I don't know what game you are playing, but I never can get much milage out of concentration spells - I mostly forgone using them entirely. Unless I hide the caster, AI seems to target them with unavoidable damange. +AC is worth nothing, against 20+ damage unavoidable granades.
edit. I also remember specifically Larian rep saying how players don't use Bless and they think of ways of making it more fun. Here is a free tip - don't make it such a pain in the butt to use.
I don't quite understand your first sentence. I'm not after an easier game. Nor harder, truth be told. BG3 has got it pretty much right.
(BG3 is not noticeably easier nor harder than Troika's Temple of Elemental Evil from around 20 years ago. Combat wise they play similar except BG3 has verticality and ToEE has 3E buffs.)
There are two tedium's you and I are talking about:
1) The tedium of casting bless and clicking targets every combat, both in clicks and predictability of spell cast.
2) The tedium of Bless affecting someone instead of the ideal 3 targets, so you have to move and jostle to get it right.
But for me, there is no tedium #2. Bless is such a good spell, I don't care if it affects a familiar instead of say Lae'zel. The spell is so powerful it's already delivering value. (And with experience, my familiar is often not in the way.)
Yes, Concentration spells go down. That's 5E. However, most combats are decided by round 3, and concentration spells can last 1-2 rounds. Winning these first rounds are key, you leverage gains to focus-fire someone down to have an action-economy advantage. From there it's just potions of healing as you whittle down the threats to irrelevance.