> If there was a way to disable this, first thing that the grandma would do is watch a video how to disable that and lose security from then on.

My grandma absolutely would not watch and follow a video on how to e.g. disable Gatekeeper, nor do I think she’d be able to if she tried.

Your grandma sounds substantially more tech savvy than my grandma. Good for her, she seems to know what she wants. Grown adults should be allowed to knowingly opt into an additional level of risk.