Depends, I think it is an issue only when you are forced to use cramped roads with large forces. Otherwise you can spread out (to avoid stun lock by rocket arty) and use tube arty to pound enemy strong points.
Keeping a large force spread is very time-consuming and sometimes next to impossible when you want all of them to attack something at the same time. Also, you can never save all of them.
Just because you, or your team, cant be arsed to micro the units doesnt mean MLRS need a nerf, you just have to play better. You seem to miss the advice to use artillery yourself, because any tube arty will shred MLRSs to pieces.
They made so much changes to the MLRS that you can only laugh at it now.
What's so funny about having all your non-heavy units stripped out of a certain radius?
Its funny because, if you spread out, they need a lot of supplies to kill single units > making MLRSs less potent