In regards to being a soft reboot, I want to bring up something RedLetterMedia mentioned in their Ghostbusters Half in the Bag episode. If this movie was made entirely after The Force Awakens do you think they would have gone the soft reboot route?
I honestly don't think so. Remakes of old movies, unnecessary or not, get announced like every other week. Hollywood execs seem to have a problem of always being late to trends or what have you and doubling down too quick expecting similar success to the high watermarks money wise. Be it MCU or whatever else. I think a lot of execs see Star Wars as a sort of anomaly fanbase wise, while also not realizing why Force Awakens worked as a success(fantastic marketing, promising something to a new generation while reminding people why they like the original movies in the first place, etc.).
Leaving movie quality out of it(love the movie personally, but that's not what we're talking about), Force Awakens was smartly done as a marketed product on all fronts. The lessons execs learned from it seem to be people want old brands back, but none of the context of why it worked. Mad Max and Creed might not be as successful as Force Awakens, with Mad Max doing alright but not good or great, are still very similar to Force Awakens in the way it approaches being a new movie in an old franchise. Having respect for previous installments and long time fans while being done in a way that makes sense for the modern era. They stick out due to their old sensibilities instead of following trends and are new in enough ways to earn the right to be a part of series.
That said, Ghostbusters was never gonna go the soft reboot route, anyway. They've tried for so long with the long rumoured Ghostbusters 3 and it could never get off the ground due to many factors. In many ways Sony decided it wanted a new one and realized that a soft reboot wasn't feasible. So they dove headfirst, and gave the name to a formula that has been successful lately. I don't think having an all female Ghostbusters movie was made as a political decision as much as it was a business one. Some of the biggest comedies lately have been Fieg and McCarthy's work, so it made business sense to them to have their already successful brand attached to what is already working in the comedy sector.
The MRA's came later like they did with Mad Max, which is not so much a "feminist propaganda" movie as it is an action movie with good female characters that were treated with respect. Dredd was similar in being an action movie with well done female characters but nobody brings it up in said discussions because it's not as highly marketed, successful or award winning. With Ghostbusters it was a bit less daring of a call but since it's less about the movie and all about the cause for MRA types, they bitched anyway. Sony decided to play the "political" route as really that's all they had going for them after footage didn't bring about excitement. Probably the smartest move they could have made, but it didn't work out like they were hoping.