This is a bit like asking why we bother to vaccinate against certain diseases if nobody ever gets them. It’s *because* of the vaccines that people don’t get them.
Websites, platforms, services, etc., are always going to have bugs in them. Some of them might lay dormant for a while until a browser gets updated, or a user does a particular and unusual sequence of things. But the bugs are always there. When they crop up, somebody fixes them. This might be doing something to prevent that big from happening again, or might just be dealing with particular cases until an update can be rolled out. Sometimes (likely most times) these fixes can introduce other dormant bugs.
If you don’t notice these problems happening with the service, that’s because there is a team working away in the background to fix them. Remove the team, and you end up with a bunch of errors that aren’t getting resolved. Eventually, this could cause other problems which cascade out of control until the whole service just falls apart, like mini events causing a city to gridlock.
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