Whether all or any of that is true or not has nothing whatsoever to do with the fact that locking tuners, whatever they do, will not replace the function of a locking nut. There is nothing any kind of tuner can do to counteract string sliding friction in the nut slot.Well you have a right to your opinion...but most companies like schaller...grover...grotoh...have gone to adding the option of locking tuners based on the fact that if you bend alot or try to use a stock fender floating bridge (Which should just be locked down anyway) that its going to mess with the windings around the peg, and it will loosen the string and try to change the position...and that is simple HS physics...what you want is to have very few windings and the strings locked into the peg to eliminate the string from slipping in the peg.
Id normally just take your word for it...but either I have to believe you and all those tuner peg manufacturers are wrong...or put my faith in all those manufacturers who have locking designs.
As to whether the tuning manufacturers are wrong... well, it's not whether they are right or wrong, it's whether or not they have a gimmick they can sell.