I don't think I've seen a reasonably modern building around here (Vancouver, Canada) over 2 floors without an elevator. I expect we have accessibility rules that require them for anything other than individual private residences.

Much of Europes dense inner core multi-storey construction predates lifts.

At the time the buildings were constructed, 5-6 storeys was a practical limit.

Not just people, but food, water, and waste travelled by stair (or, in the latter case often, air).

5 floors is also about the limit for wood frame construction, you need a more expensive building style to go higher. Obviously consult a civil engineer for details.

What this means in practice is you don't build between 6 and 10 floor buildings because the numbers won't work out. (obviously there are exceptions)

You can do six, but the sunlight at the top really has to be great for it to be worth it...