You're right. However, LGP/E is manifestly a worse competitive game than US/UM, having no rating system, substantially less in the way of mechanics and no incentive for those who already play competitively in US/UM. If you would want any depth out of your experience playing competitive Pokemon, LGP/E isn't the place. You would only match with casual players who have limited interest in optimising a team: to call that competitive is very generous.
If I had a problem with this question I would click 'hide' on it. I just think it's worth it to voice that these games are dwarfed by the older ones if you want to play seriously against other serious players.