Tesla's definition of a site being 100% up is at least half the plugs working on a given day. If 50% of the plugs are working then Tesla deems the site to be 100% up.

So 99.95% uptime sounds better than it is.

Nobody wants to go to a charging site only to find they don't work.

Same story for petrol stations. The only difference is petrol stations have been around for a very long time so already dealt with the reliability problem. Ev charging stations have room for adjustment.