It seems extremely unsafe to use one with an insecure grip
I had never thought about this. (Of course, I’m a rightie.) It’s fascinating how many things like this we take for granted.
The worst things are fountain pens. My parents told me I can’t write with them properly because I’m lame. It turned out 30 years later that those are for right hand only by design, and only top quality ones write properly if you push it on the paper. Of course we didn’t have one of those.
The training I did only taught “the right handed way” despite me being a lefty since that’s the only “correct” way of using a chainsaw. If you learn that way it becomes natural, like using a mouse right handed. If i pick up a chainsaw without thinking about it it immediately feels wrong and a switch to right hand grip.