The strategy change is easy to reverse once you know where its stored. The only upside being most users don't have someone to hexedit for them. A good tuner won't lock a file, they don't need to. Ive dumped tons of tunes and compared them and they aren't much different. The biggest thing is how far some tuners push the limit as far as rich/lean and cylinder pressure/torque limiting. Some tuners tweak a lot more than others but most users probably don't even notice.
I used ajpturbo primarily because he explained everything he saw and did and why.
Think of it this way, you can't steal experience. Knowing what number to type in vs knowing why is huge.