@Blue Hills you'd be proud of me. This question was brought about because I changed my seat post!! Before starting I measured the hell out of everything. My Cervelo and Kinesis are identically set up except the saddle on the Kinesis is angled down and forwards.
Two issues occurred tightening the seat post clamp, my multi-tool coped but the old "L" hex was too worn to do so. I found setting the angle tricky and I'm sure having a hex with a handle would ease this. Simply easier to hold/use.
The other thing is I frequently remove bottle cages when cleaning and find the "L" very fiddly and the multi-tool even more so.
My "L" set is probably 15 years old, at least. As I bought it when I used to fettle my lads go-kart. Yes, weird, I learned from scratch how to fettle a kart right down to stripping an engine but never the bike.
I'm fairly hopeless but happy and my bikes wear out, never fail. 🤞