you can call reverse slope defense a "nonsense idea" if you wish. The fact remains, it was, and still is a valid, viable and taught well; sound military tactic. ASL is a game, so I have qualms about how well or poorly it tries to illustrate anything based on realism - you can't have realism in a game. Well, in ASL's case, it is a realistic simulation of a 1950s-1970's era WW2 fictional movie setting produces by Hollywood, or a times, perhaps even "B" rate Western European movie studios of the period. It is pretty realistic for that purpose.
But if it creates a mood or an idea of what challenges are faced by company-level to battalion level command staffs in any action, presents a few of the myriad of dilemmas they actually face in regards to terrain, tactics and troop availability - then ASL succeeds, and the scen design does as well, in my book at least, as a wargame.
As always, YMMV of course. Frankly, I think the # of 10-3s that appear in a RB CG III in the German side by around scenario 20 or so is ridiculous. Having more 10-3s in play than the countermix allows is a bit over the top. Again, YMMV.