I don't actually mind the nostalgia stuff to be clear. There's a local band I really like who did a 20th anniversary show for their first album where they played the whole thing in order. It was in a bar, attendance was good for that bar, but they barely made anything off of doing that show. Had nothing to do with money, they did it for fun.
I also think SOS could have been cool, but the recreations wound up being unbelievably boring because the vast majority were either too safe, badly done, or both. That's the real problem with modern U2. They're too safe now. They filter everything through the lens of it needing to be a clean, easy-listening pop song. Some good stuff has survived that filter (Little Things, RFD, etc), but it kills most of their new stuff. I suppose them turning to nostalgia is driven by them having lost their nerve, but imo them doing a nostalgia tour or two really isn't the problem. You could argue it's a symptom of the problem, but it's not actually that big of a deal unto itself. If SOI and SOE had both been interesting records and they had still done a Joshua Tree nostalgia tour in the middle, I would have no complaints at all.