That's just the consequence of professional specialization. But the expected consequence with FOSS is that, if you can't or don't want to do it yourself, you can always pay a third-party specialist to go in and fix your copy of the software. In fact, it may be further expected that in this case, you'd have multiple competing specialists to choose from - just like it is in e.g. appliance / home / car repair, where you can go to whichever repair person you like and they'll fix stuff for you.

You can observe that most software is leased, not sold, thus restrictions apply. And indeed - the same holds in physical world; if you're the house/appliance/car, you might not be able to use it the way you like, or get whoever you like to repair it. But that's precisely the problem! Renting instead of owning has serious drawbacks, and Stallman is fighting against those, trying keep us at something more akin to personal ownership model.