I have participated in plenty ffa, fpk, 1v1, 2v2, etc etc tournaments.

If you apply constant pressure to a sin, it makes it extremely difficult to do the l8z technique.

Trust me, the only class I play is sin on vanilla and here and d2pk. I've played al the classes of sin, ghost, hybrid, and trapper. Again, if you apply constant pressure, I don't have time to l8z, mb lock, tele and reapply traps, rinse and repeat.

If you play defensively against a sin using any sort of traps as damage, whether hybrid or trapper (not using ghost as an example as traps aren't used for damage, just as a mb lock with WoF), the sin has all the advantage.