The fact it's a concentration spell already makes it a tactical decision. You have to worry about concentration being broken (which is easier in this game than in tabletop due to various homebrew Larian changes) and you have to choose between having it and having a different concentration spell. They've just made Bless more situational to the point where its potential use cases make it pretty pointless and tedious to use. And the single click to cast is a dumb idea because you're probably wasting way more time trying to make it hit all the targets you want it to, as opposed to speedily just clicking who you want. Also, they let you click for damage spells, so clearly reducing clicks isn't all that much of a concern for them. Also if your good party grouping involves a familiar, enjoy the tedious time spent positioning it so you don't waste it on a familiar instead of one of your party.