Lemmy needs serverside hide features for posts and for communities or I’ll never find real interesting communities hiding on the 10th page of top feeds. This lack of functionality could cause the top feeds to stay trash permanently and drive away users. Especially when new apps are constantly appearing, client side hides are more or less useless as I switch between apps.
Reddit post hide features are fairly performant because they quietly expire after some period of time. They stay in your “hidden” list but actually will start showing in the results again if somehow that content is still visible. You can see this on super slow or abandoned subreddits if you hide every and come back a month later.
Reddit community blocking features have always sucked with the serverside limit of 100. Seems even more dire in Lemmy when the same shitposting communities spring up on different hosts
There are an endless number of places where the speed limit data does not match the actual speed limit. My car has the speed limit wrong on hundreds of small back roads and even segments of highway. This encourages not actually paying attention to posted signs.
Failing that, you can be going the speed limit and then the speed limit drops or increases by 15-30mph suddenly. Like highway ramps for example. Most people coast into the lower speed after the change or accelerate into the new speed in advance of the change. This would encourage hard breaking at extremely dangerous places or entering highways at incredibly unsafe low speeds.