Where does this notion that gebirgsjaeger are elite commandos come from? As far as I know they are just guys in a mountain division with a bit of different training and equipment. They arent special forces like people seem to think, but an entire division that takes and hold territories same as any other line unit.
Why do the soviets need an equivalent unit call in? Germans only have a single infantry call-in, and thats with a single dlc commander. the role of the unit is not to be an op superweapon that requires a rival p2w dlc to counter, but a harassment unit that works with good micro
edit: regarding use on summer maps, they would still perform the same role of decapping and harasssing
Well their fame derives mostly from their extraordinary combat performance during the fightings in Norway at the beginning of the war.
I'm sure the reichspropaganda also had it's fair share making them famous.