Benjamin Olson
Hero
I'll start campaigns intended to be short at whatever level is appropriate to the sort of threats the characters are facing.
If it's going to be a "grand campaign" I usually want to start at level 1. Though even then if players had character concepts that required a little multiclassing to properly represent or didn't really make sense until they had their subclass I might start higher. The issue is less pronounced in 2024 5e than in 5e classic though since everyone starts with a feat now (usually the issue was wanting to tie magic to a character background but having to do a few levels before they actually had any magical ability. Now they can just start as a magic initiate).
If it's going to be a "grand campaign" I usually want to start at level 1. Though even then if players had character concepts that required a little multiclassing to properly represent or didn't really make sense until they had their subclass I might start higher. The issue is less pronounced in 2024 5e than in 5e classic though since everyone starts with a feat now (usually the issue was wanting to tie magic to a character background but having to do a few levels before they actually had any magical ability. Now they can just start as a magic initiate).