Think about what you actually did there. You told a grown man his system was wrong, handed him a tool he did not ask for, and now his entire digital life hangs on a piece of paper in a drawer that a grandkid or a cleaning person could pick up. Writing down a master phrase is a single point of failure too, only now it unlocks everything at once instead of one recipe blog. A reused password at least means a breach hits one site, not the drawer paper that opens all 40 plus his bank. Maybe your uncle is right that nobody wants his recipe blog, and the real fix for him is turning on two step checks on his email and bank instead of a whole new habit he will not keep up. Asking him what he is actually worried about losing would have gotten you further than freezing up.

Man, my buddy went down this exact same rabbit hole last year and it messed with his head for months. He read somewhere that you should draw from your shoulder, so he started taping his wrist to a yardstick and holding the other end like a pool cue, no joke. His lines got way better in like three weeks, but then he was convinced he could never draw without the stick and had a whole meltdown about it. He finally quit cold turkey and yeah, his lines wobbled for a bit, but he said the arm memory stuck around and he was back to clean lines in a week or two. So my take is it's not a crutch if it teaches your arm what steady feels like, you just can't camp out there forever. Use it to train the muscle, then slowly loosen up, first the elbow, then the wrist, and you'll probably keep most of the progress.