My two pennies worth.
Don’t discount an enduro bike based on riding on waterlogged mud and grass.
Be honest,how far would a big adv bike get across that ground?
And what tyres were fitted to the bike ridden?
My experience of a ktm 525 with properly set up suspension and top spec rubber ,
It would literally climb a mountain,it seemed to be unstoppable, and made things too easy.
A bike I regret selling but at the time I thought it would be a case of when it would bite me rather than if.
The stuff you regularly do on a big bike may well be very sedate on a proper enduro bike,and may lead you onto more challenging stuff,
Or the challenge of a big bike on the dirt may suit you better.
One thing I will say is a proper off road bike will be substantially cheaper to maintain if used extensively off road than a big adv bike