Gather round the fire, it's story time!
In an insignificant land, in a forgotten table tennis hall, there are two players. They are amateur players, who haven't yet unlocked the secrets of the game. They both have a decent forehand drive (as it is more natural to learn) and they both have problems when the ball is on their backhand side. Also, both have problems reading and understanding incoming spin, so they are both making a lot of mistakes and giving easy points.
One of them in an unpredictable turn of events, changes his backhand to LP. TA-DAAA!! He suddenly doesn't have to worry so much about incoming spin or speed. Now our 'villain' can put the ball in the table with more consistency, so he can focus more on placement, and also gains confidence in his game. Also, the balls that our 'hero' with inverted on both sides is getting, are something entirely different than what he is used to.
So now the 'villain' is consistently beating the 'hero', without any real increase on his level of technique or overall progression of his game. That's why, at some point our hero can't take it any more and exclaims "You only beat me because of that #$!$!$#% rubber! You are cheating because you can't play real table tennis!".
Of course, our hero's statement is only half true. Yes, his opponent's change of rubber was the most significant factor to his sudden improved effectiveness, but that doesn't mean that it is cheating nor that it is not real table tennis. Ok maybe it feels a bit like cheating, as half of the times the villain doesn't even know what he is doing with his LP, yet that incredibly works in his favour as it confuses the hero even more.
Time passes, and with more training, the hero who is of pure heart, slowly unlocks the hidden knowledge of spin in table tennis. He can now read spin better, produce more spin, and is able to exploit the weaknesses of the villains LP backhand side... and finally beats him! The evil is defeated, the universe is saved, the force is being brought balance to (<-- not sure about the syntax in that one!
), the hero gets the girl (who was secretly admired him but ignored him in order to have motivation to realise his true potential and other such cliches), and everything is right and well!
End of story... or not?
Because now the villain, disgraced and alone, vows to revenge and... ok ok, I get it, I'll stop now, no need to threaten me!
The point of this little semi autobiographical story, is that for amateur players it is easier to play
with LP, as they have less variables to think about while it is considerably harder to play
against LP, as it involves concepts that are unlikely to be in a beginners training. That's why you hear mostly amateurs complaining about it. With time you learn to deal with it, and start to appreciate the brain tease and the diversity different types of rubbers (or playing styles) are bringing to the game!