Jamming in maa is god awful trash. You send a scout into a base and jamming is longer a factor. For jamming to ever matter it relies on an opponent to have consistent radar coverage and also never “identifying” the unit thru vision. If it is identified, it needs to be manually reset in order to add radar signatures again. So the only time this maa is going to matter (just standing around in base doing nothing) is in the situation of a dude refusing to scout your base, and once he does scout your base the jamming does nothing as it will already be known where the valuable targets are.
It also has 0 effect on unit spam as reasonable mixes rarely include a large degree of maa so you wont get much of any additional signatures and even if you do, it will make a mass of 20 units look like 25. Who cares.
If it’s OP for t1 then add it to some unit part of t2 raids. Thing is adding it to mongoose or pillar are also gonna be said to be OP.