True, without practice, neither tool is likely to lead to the desired outcome.
A gun is useless to some, especially those who are afraid to pick it up. A knife is useless to me - unless the attacker is a truckload of Amazon boxes.
You are welcome to believe (and be statistically incorrect) about whatever you like and decide as appropriate for you. If you don’t feel you can operate a fire extinguisher or motor vehicle either, everyone will respect your choice in tools.
The rest of society asks that you not make personal defense decisions for us.
Speaking as someone on the weak spectrum approaching elderly status, I’m convinced having a gun is more likely to end up leading to me being shot.
The presence of guns invites escalation. I’ll take my chances without.