Im also convinced that doing away with sugar and carbs after exercise helps with recovery as your body has less inflammation to deal with.
I'm sure you're right. Some people definitely have intolerance to carbs generally. My partner had suffered from IBS all her life - tried all sorts of options - eliminating gluten, no bread, steering clear of numerous different things in turn, allergy tests etc. Nothing helped stop the excruciating pain & cramps, diarrhoea or constipation, but she could only reduce the symptoms.
Until she went keto, and became a different person as far as her gut was concerned. Provided she doesn't consume for than about 30g of carbs a day, then she's fine.
I didn't find it too much of an issue adapting what things were cooked for a year or so, but I went down the keto route only after doing the research, and reading various technical books from Drs Phinney & Volek. Never had an issue now beating lots of people on sustained ascents.
As well as not bonking, another nice plus is that your bike isn't splattered in sticky residue from gels or from what's in your drinks bottle.