Earlier quoted context omitted.
I've retrofitted the Morale mechanic into DND5 and PFRPG1 as a Will Save. I generally run HERO System, though, for both Fantasy and for Star Wars. In HERO, minions of all sorts have to make EGO[1] rolls with cumulative minuses[0] for casualties AND for any BODY damage[2] taken. Fail the EGO roll and there is often is a "collapse cascade" effect as retreating/surrendering units are considered casualties, makes the ste…
HERO system Star Wars. What a magnificent grognard.
A small but significant part of that is the vehicle/ship rules use the same combat resolution mechanics, same stats.
Combat mechanics are complex but consistent: a hobo streetfight resolves identically to a clash between gods. Unlike levelled systems the complexity is heavily frontloaded.
Having said that, I really like WEG too. The d20 and FFG systems have giant loopholes containing "I WIN" buttons that take my playes all of fifteen minutes to find and spam the hell out of. But FFG has the best module / adventure design, of any Star Wars system, of all time. Their prepublished adventures are a masterclass of the art. I've used them in HERO, just swapping the mechanics and those goofy ass FFG dice.