Psychology was a Jewish scheme to learn people's most private secrets so they could later use it against them. This is why so many definitions for illnesses are subjective and have massive overlap where no 2 shrinks will agree on where one starts and the other ends.
You can tell there was no intellectual honesty when homosexuality was removed not because it isn't an illness but because the gay lobby became so powerful it was less hassle to just remove it than deal with the lynch mobs and legal fees.
Gaming has been added because it gives shitty parents and greeding in laws a way to abuse their family members who want nothing to do with them. They will use it to claim their nephew is an addict so they should get all the inheritance or as an excuse to send their kids away to behavioural boot camps because after 15 years of working 9-7 and then putting the kid to bed the kid prefers the company of his online friends to his own family who all but abandoned him.