The steak/cheeseburger comparison is not a good one because that is the essence of your meal. One ride is not the essence of a trip to WDW. A ride being closed for refurbishment or going down unexpectedly has always been a factor in a Disney vacation. In this case, people know about it 45 days in advance and can pick a different FP to replace the one they selected.
I don't see this as a FP+ problem or a first world problem because I don't see it as a "problem". It is at most a minor inconvenience or annoyance that an adult should be able to cope with pretty easily. Sure, it's an inconvenience that arises in the context of FP+, but the same kinds of inconveniences happen all the time. Like if you go right to RNRC at rope drop and find that the ride is down and by the time you hustle over to TSMM the standby line is 30 minutes long already. If you had known RNRC was going to be down you would have gone right to TSMM and had a shorter wait.
What would you do about that? Complain about it and let it affect the rest of your day or accept it and move on. On our recent trip to
Disneyland we arrived at 7 AM knowing the crowd was going to be huge (week between Christmas and New Year's) and SIX different attractions that we went to in the first 90 minutes (Space, Buzz, Matterhorn, Indy, POC, and HM) were down when we first went to ride them. And paper FP didn't help because they weren't issuing them while the rides were down. We had planned to pick up a FP for Indy, and when we came back a little later the standby line was already up to an hour and it took us about 15 minutes to get through the line to get a FP. So, we had to rearrange our plans but we still managed to do every one of those rides as the morning went on.
If you expect every last detail of your Disney trip to go exactly according to plan, you are likely to be disappointed. That has always been true and always will be.