Another aspect: imho very good systems for long running campains are those without levels, CoC, Symbaroum, Delta Green, or those with slightly other mechanics like DSA.
D&D in all of its editions either was getting imbalanced (original, 1e, 2e) or just linear wit more and more effort to handle encounters (3,5e and i guess 4e). 5e i do see as less problematic than all of those former editions, if you handle it well and do not use the ssumptions of the former editions. It still can get derailed pretty easy and reuires loads of prep but less effort on the table.
D&D in all of its editions either was getting imbalanced (original, 1e, 2e) or just linear wit more and more effort to handle encounters (3,5e and i guess 4e). 5e i do see as less problematic than all of those former editions, if you handle it well and do not use the ssumptions of the former editions. It still can get derailed pretty easy and reuires loads of prep but less effort on the table.







