Do I really need to separate my morning and night skincare routines?

I'm always wondering if it's okay to use the same skincare products in the morning and at night.
There is a lot of talk about keeping the morning light and replenishing nutrition at night, isn't there?
However, when you actually try to divide your routine, it can sometimes feel more cumbersome than you thought.
I also became curious about how much the difference between morning and night skincare actually affects the skin.
I'm not sure what needs to be different besides UV protection, either.
I'm also confused whether there really are products that need to be used only at night.
I'm also wondering if it's better to manage things separately or if it's better to keep things simple.
I want to hear some realistic stories on how other people differentiate their morning and night skincare routines.