In the grand scheme of things,
very few people have flipper zeros. Few even know what they are.
Meanwhile, I think a pretty high percentage of households have a screwdriver.
> All "recent" cars (as in everything from about 2000 and up) have an immobiliser
You mean some kind of wireless communication protocol that can be hacked with some kind of handheld SDR device? Why is a keyless entry trivially bypassed but an immobilizer transponder, gee, that's just impossible to hack.
Everyone can operate a flipper zero with a cusom firmware which could bypass a transponder. So then all you need is the flipper zero and a screwdriver. Wow such better security for the hassle of having to actually stick the key in the hole every time.
I'll still take the keyless option. If someone really wants in my car, they're getting in. If they really want to steal it, they'll steal it. Requiring the thief to have an RF hacking tool and a screwdriver just isn't that much higher security in the end IMO.