Less of a ramble this time.
Endurance is for many players, a somewhat redundant skill. Even with 0 spent in it, boosters can make it up.
A horrible generalisation of course, certain weapons use a lot more than others. And then there's melee....
One issue is that the actual effect on your stamina pool by the END skill is rather small compared to the other factors; only 40%, with 40% being 'Base' and 20% from CON.
A suggestion might be to rework this as 20% Base, 20% CON and 60% END (rough starting figures).
This would mean a choice between dropping points elsewhere or having to rely more on boosters.
That brings us to weapon choice. Should all weapons consume Sta at an equal rate, and if not, what negative/bonus should a low/high Sta using weapon have respectfully?
As for melee, well in either case, the Sta amount needs to come down.
But here's another idea:
10% Base, 20% CON, 50% END and 20% MC?