Ask HN: Experience increased breakages with advent of SPAs?

Is it just me? Or does it seem like online web portals are more brittle now and days? I've noticed nearly everything, from my local credit union, to my gas utilities company, to my lease web portal, are all written as SPAs. And I see little reason for them. They mostly need to render and input basic information. Seems like engineering overkill. And as a result, I find they are always broken in some fashion. Pages fail to fully load. Back button introduces broken state. All kinds of other wonky behavior. I don't remember sites being as broken as this in the past when they were written as MPAs.