Demos have been targetable for quite some time now with more than adequate detection radius. S mines are not targetable, cheap, plant like lightning, are dangerous to defuse with troops or require the time of a vehicle (something clever players have learnt, so they add a teller) or wasting munitions or time to barrage (SU76 exempt) to clear the clusters.
Axis do not suffer the same waste of time or limited mobility defusing/destroying mines that allied factions do. One grenade, mine gone. Detect and target demo gone. If you are suffering movement problems against allied mines, more than likely you are lacking in the detection department.
Personally I like the flare mines right where they are, but thier plant time and the USF mine plant time compared to S Mine field is s complete joke. 1 mine vs 4 clusters and the new USF mine is done by the time half the S mine field is done.
Perhaps S-mines need changing too then. But what you said about Axis being able to harrass as well as Allies is wrong:
Harrassment around the edges of the map is best done by lone squads. This can't always be a sweeper unit. It just can't. So axis players have a choice -
1 - send a standard squad that can easily be wiped by a mine (clumping) or demo (because demo)
2 - buy an extra sweeper unit and send that but accept that if they come up against an enemy squad, they'll soon have to retreat.
Allies do not suffer the same number of squad wipes from mines as Axis. They suffer ABSOLUTELY ZERO squad wipes from enemy demo. If you insist on disagreeing, feel free to post some high-level replays where more allied units are wiped by mines than Axis units by mines and demo.
TLDR - I'd be glad to see every faction's mines reworked so they stop wiping squads. Nerf them all, just stop the insta-jibbing. And please stop denying that it's a more serious problem for the Axis.