I voted "Limited time and resistance to change" but the real reason is we are old. At least for the primary group. We have mostly played D&D in recent decades but back in the day we tried a lot of other. Now there is resistance to learning new rules. If 2024 D&D was not addons to the base of 2014 I do not believe the group would have changed no matter how much I loved the new rules.
The younger group I am involved with might be more open to change but I do not referee for them.
The younger group I am involved with might be more open to change but I do not referee for them.