I noticed this a lot with the first character I created using Gale and seeing him get targeted, the second character I made I went with a very melee heavy team with no cleric and I actually found it to be pretty effective way to counter this. While it won't work for every encounter, if you think there's going to be a potential fight, have your caster or squishy ranged member enter sneak sneak mode and have them join in from a far distance after the fight has started with your melee and tanks. This gives them some protection with spacing while your melee start hacking away at things, then if they do want to go focus your backline if they can't disengage you have all the opportunity attacks to soften them up on their way. I had a melee based ranger, fighter, rogue, and warlock doing that with the warlock entering in the turn after and it was mowing through encounters.
