I think it depends on the person and the type of infection which drug is hard to take. I can take Prazi forever without a problem but one dose of albendazole and I feel like shit.
I have (may still have) liver flukes. I took lots of prazi for 3 years to get them under control.
I did take Ivermection and Prazi together and had no problem. It is given together to animals so I felt there could be no harm.
So, I'm not disagreeing with you just saying everyone and every situation is different.
I switched from panacur to Oxybendazole because I thought the parasites had become tolerant of the panacur. Turns out the oxybendazole works much better and the dose is extremely less than that gross panacur. My dogs and cats much prefer the oxybendazole. No need to dose for 3 days.