This would seem to be at odds to your prevoius comments, thus...
Again, I said NOTHING about the system being unreliable, or complex.
Yes, the feather button frequently failed to pop out. You can call it a holding coil if you like; as an electrical switch being held in place by an electric field, it was a coil; it was also called a feather button, and was named as much in the aircraft flight manal and the maintenance publications I used. This is irrelevant. That the buttons do tend to stick in and should be guarded when feathering the aircraft is a fact and good practice.
Given your proclivity toward declaring anything that isn't an L-1011 to be unworthy, one might presume that you deem all else to be complex and unreliable.
Personally, I never found the ham standard to be complex, and unreliable. I've flown them into places that most could scarcely imagine, I've had them apart and overhauled them in the darkest of places in the dad of night over 55 gallon drums, and have installed them and removed them countless times...and really can't say I ever considered them either complicated, or unreliable. If you find them to be so, so be it.