It’s the “grandpa has been using slotted all his life so it can’t be bad” reasoning. I can’t think of a single use case I’d want slotted or even philips, if I’ve got a choice. Torx or bust!
If you’re having trouble with Torx, buy better screws and bits. There are so many terrible screws around. The difference between a deep well fitting head and the cheap trash is massive.