Maybe those other microwaves have a different design that doesn't make it necessary. So, sure, you can re-design the microwave oven, but that may entail significantly more work than to just deactivate the fan.
I could criticize cars with combustion engines for having one and being so noisy/stinky/... Then I could go on claiming that they should just turn them off, cause there are cars without combustion engines which are less noisy/stinky/... I'd be missing that there is more to it than just turning off the engine. I'd need to replace it with something else, like an EV. Maybe that did not exist yet when that car was build. So, claiming that this old Ford from 1970 having a combustion engine is stupid because "this is not a problem that other cars have" is missing the point. I could go rip the engine out because I don't like that it's noisy/stinky/... But I'm in for a surprise here. The vehicle won't move anymore. Something I'd have understood had I followed the principle put forward by Chesterton's Fence.
> Chesterton's Fence tells us that there is no cost to eliminating this ridiculously awful functionality
No. It tells you to first understand what you are doing. Blindly claiming something misses that part.
I could criticize cars with combustion engines for having one and being so noisy/stinky/... Then I could go on claiming that they should just turn them off, cause there are cars without combustion engines which are less noisy/stinky/... I'd be missing that there is more to it than just turning off the engine. I'd need to replace it with something else, like an EV. Maybe that did not exist yet when that car was build. So, claiming that this old Ford from 1970 having a combustion engine is stupid because "this is not a problem that other cars have" is missing the point. I could go rip the engine out because I don't like that it's noisy/stinky/... But I'm in for a surprise here. The vehicle won't move anymore. Something I'd have understood had I followed the principle put forward by Chesterton's Fence.
> Chesterton's Fence tells us that there is no cost to eliminating this ridiculously awful functionality
No. It tells you to first understand what you are doing. Blindly claiming something misses that part.