I'm not sure how he hit the nail on the head. Other than the point where the player explicitly only builds one patch (and thus the time reduction being significant), his other arguments were "The mine is working how it is supposed to work"
The Pioneer takes extra damage while clearing a Soviet mine. I'm not sure why it's argument against s-mines.
Soviet mines block choke points and require a sweeper as well. I'm not sure how this is an argument against s-mines.
This thread should just be "Mines are broken because they require minesweepers to clear, sweeping takes too long, and the engineer/pioneer take extra damage while clearing"
Mines are deactivated when they are detected. Nothing is preventing you from flanking an MG if you have an engineer around. The detection works even if they are pinned.
You can't compare S Mines to Soviet mines, they are completely different and have completely different uses. S Mines are for area of denial, you don't just clear 1 mine you clear heaps. Soviet Mines are put there just hoping a vehicle will drive over them. Besides German's don't have to even clear them if they don't have the time. A single Rifle Grenade or Flamer burst will destroy the mine.
Edit: Though the point about the reveal into Con flank is good, probably a good way to try and push out.