A point of view:
I see GOS as a substantial improvement no matter your situation, but if I were to introspect and only consider issues internal to my relationship with tech - never mind the external considerations, or threats - the benefits have far exceeded my expectatios. Unexpectedly so. I'll elaborate.
Moving to GOS was the impetus to start cleaning up my digital life. The questions I had to answer led me to adopt digital minimalism, forced me to declutter and organize. For the first time ever, I feel like a have a degree of grasp over my affairs. I also spend less time on my phone now, a great benefit. And I'm keen on keeping improving, as pondering best course of action game-ified it. My memory is also better - number of made up words I committed to it would have boggled my own mind just a couple of years ago.
But the biggest benefit - far bigger than any of the above - is this: Sure, IMSI, IEMI, SMS, and all the other acronyms are a problem. But, those are the things happening to you. Are you going to just give up? Sitting with the head down, like a sheep and taking it? GOS, however modest or futile it may seem on the outside, allowed me to have agency over what was happening to me. It's one way to take back some of the control our society has ceded. And that is, as they say, priceless.