The Nintendo Switch v2 (and Lite) is supposed to be almost double those values.

According to Nintendo; You must charge your Switch at least once every six months or the battery might die on you. Probably because it is physically attached to the device. Laptops have similar warnings, but you can just remove their battery when you know you are not using them for a long time. I think also this issue can be compared to leaving batteries in a game boy for an extended period and they leak and s**t all over your precious device.

The above battery leakage actually happened to my GBA ages ago (R.I.P.)