1 spring that is going to take A LOT to get a fail out of, I dunno about the liner or frame lock you have had but all mine have massive liners of steel holding my blade in place, not a tiny rod held in place by a even smaller spring.
I'm not a fanboy of any particular lock. I use them all. Just bought a titanium framelock tyrade a few weeks ago.
But your comments are irreconcilable.
"I find myself not being able to trust a knife thats whole function relies on 1 little spring."
And then you go on to criticize that the axis lock uses two springs.
But which is it? Is one spring bad, or is two springs bad? If two springs is bad, why do pretty much all non-linerlock based knives using two springs instead of one? For that matter, why do virtually all engineering efforts where safety is an issue include redundant systems and fail safes?
There's no correlation between the thickness of a liner and the reliability of the lock. Theoretically, there is a strength correlation, but when liner/framelocks fail, it's not due to insufficient strength (for that matter, modern locks on quality knives virtually never fail due to insufficient strength). It's a reliability issue. Redundant springs address that issue. The axis lock, or hawk lock, etc, do not derive their strength from the resistance of a given spring. The spring is just positioning another piece of steel in the path of the tang. The only force needed is to reposition that tiny piece of steel, not to resist the force of the tang.
Besides, the spring isn't the entire lockbar. The spring is that tiny, itty bit milled out part of the liner/frame usually near the base.