Yes because the piece of paper doesn't give me a visual reminder when I forgot to make an entry.

I can tell you what would happen if I'd use such a calendar because of ADHD:

Pens will get lost.

When it's time to replace the paper for a new month or year, I would procrastinate on that. Potentially for a very long time.

I could also not use that paper calendar for anything else because I can't manage my appointments and schedules on paper (frequent corrections, reminders, paper doesn't have backups and copies, ...).

I can't take the paper calendar with me so I wouldn't have my appointments on the go. Having two calenders would exponentially grow the problems described above.

They're just selfish lazy cowards making excuses for not changing their behavior, that's all.

They want their perfect little world handed to them by someone else and they're mad that the world has agency of its own they have to actively compete with to get what they want, which does not allow them to live the passive and risk-free lifestyle they want.

Laugh at them, for they bring their suffering onto themselves.