I have a Fairphone and i get updates pretty frequently so not sure what you mean?
That Fairphone has 13 just tells me they don't waste employee time in their small business on useless upgrades just for the sake of it. Their point is fair wages and ethical mineral mining: better that they have a workable phone without even more fluff, it seems to be tricky enough already in this world :(
The sole blocker preventing someone with a Fairphone 4, 5, or 6 from sending text messages via satellite is that they are not on Android 15.