I do think that saying bless isn't flashy is a strange takeaway.
That said the concentration mechanic in 5E really pushes players to prepare less buffs in general. No point in having half of your prepared spells be concentration if you can have one up at a time.
And in BG3 this is just worse, for reasons you mentioned and because there are few utility spells implemented (and they won't be as needed in BG3 anyway).
That said, I don't like spending a minute buffing before an encounter like you used to do in older games.
