That says everything.

I think the point was that his "tactic" was only useful in those spam games where you have 3000 points per person. 6000 points 4v4 is OK in my book, since you just have the standard 1500 pt per player.

I played against a clan who bunched up 8x MLRS like this. They had vetted heavies surrounding them and sams in every bush => unbeatable.
My teamates were mostly using medium tanks. It was a massacre as you can imagine.

Artillery is still OP against everything that isn't a heavy, especially when used in larger numbers.

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.

They made so much changes to the MLRS that you can only laugh at it now.

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.

What's so funny about having all your non-heavy units stripped out of a certain radius?

Doomed to fail because of minimum range and crap mobility and the amount of supply vehicles to bring with you to compensate for the lack of a near FOB. Many high level players like to have 2 - 4 Tube arty which are a rather big problem for your MLRS. MLRS can not blind fire (well it can but sooo inaccurate and wide spread its near useless) while tube arty will blindfire at you even more accurate the closer you get.
About your great range argument, the range is far enough to reach any point of the map from any position, with a correct shot also with the same accuracy.

What you misspell as smirches was what I believe a Buratino as a Smerch suffers from minimum range as well.

If you're still up to try it out share your experiences with it plz I am quite curious on how it plays out. I could be wrong tough I have confidence in my view.