I really don't care, I'm used to allies having win buttons and suicide m10 rushes so when I lose my allued units to similar stuff it doesn't bother me. Offmaps as an idea are fine. But they should cost munitions to buy. No reason they should be free.
No one bought them when they cost munitions. And when they were made cheap enough they became a no brainer.
There's no balancing off-maps with a munitions cost-attached to them. We found that out the hard way.
(Off-maps cost munitions in the old EIR, for several months)