Please allow me to give my humble 2c as a trained clinical psychologist.
Historically speaking psychiatric/personality disorders have been consistently
under diagnosed. This has caused profound suffering for those inflicted; when a medical reason for certain behaviors is unknown or not acknowledged, people will use alternative labels: sinful, possessed, criminal, lazy, you name it. Starting with, most notably, the DSM-IV psychiatry moved towards creating more labels to allow people to be given access to treatment which otherwise would be withheld from them. Remember that in many countries you dont get any kind of medical help unless there is an official diagnosis for it. As such, for example, the NOS (not otherwise specified) disorders came to be. Basically, it means "We know something is up (for example PDD related), but out primary labels dont really stick and if we dont give you anything you're screwed. So we'll label you with PDD-NOS and now you can get proper help from the system." When I was still active in geriatric psychology I wrote a lot of 'MCI' (Mild Cognitive Impairment) diagnoses:"You're old, something is up, you are technically not demented yet, but if I send you out empty-handed you're kinda screwed so let me give you this empty diagnosis."
It is a really good thing. I cant stress enough how many people have seen their lives improved by this!
The downside, however, is
over diagnosis. Wherever there is a label, there is a big company going to try to sell you crap you cant afford and dont need.
So it is really important that the public knows why certain labels exists, what their function is and how they should and also should not be applied. Labeling people with 'gaming addiction' can be profoundly helpful. People have literally died because of this: one famous example would be a guy who died in a (south-Korean IIRC) internet cafe by simply playing everquest until death by starvation. Less severe but more frequent cases exist; I personally know people who've gotten into trouble for skipping work to level their WoW character. The entire gaming industry is more and more intentionally fostering addictive behavior: bonuses for logging in every hour, lootboxes etc. Big corporations are spending excessive amounts of money intentionally abusing the frailties of our brains in an attempt to get you 'addicted'. Considering gaming is a bigger industry than Hollywood, and the excessive and cynical attempts to exploit people, it is potentially a good thing gaming addiction is formally recognized as a medical issue as it allows people to get access to much needed help.