GS “hardware creep”. Many of the “higher performance” GS setups (e.g. using MHX) have dedicated comm hardware on both ends. Such pairings make the GS incompatible with other SCs.
Currently, the small SC community is faced with the problem of “We have a 1000W, 2m^3 mobile GS. Won’t you please install this at your GS site? No!
So, working towards a common radio that satisfies the community requirements and can (in a GS) communicate simultaneously with multiple SCs would be a big step forward.