The Division 2 launched in a fairly smooth fashion with good optimisation and few server issues but some bugs managed to get past Ubisoft and Massive's eyes. Disappearing skills are one example, but it was fixed quickly in the latest patch.
Abilities in The Division 2 are crucial and their impact major in every fight that is more difficult than mowing down a group of enemies or blowing them up before they have a chance to react. The only catch is that some abilities would end prematurely and go on a 15 second cooldown, potentially leaving an agent in a tight situation with no ability to back them up.
The latest Massive rolled out has fixed that issue for the most part. According to the hotfix notes, it is talents Extra and Overlap that are the usual culprits behind the ability issues. These two might still cause the abilities to act up after the update but not as frequently.
From our own experience, the 15-second cooldown issue was appearing even when not using any of the aforementioned talents but it appears the problem is gone after the patch. Massive Entertainment stated they will keep working on fixing these bugs and that game health is still their top priority.
This approach is especially important for players who like Dark Zones and Conflict as they involve PvP and inevitably - the one-shot sniper build. A drone with the Defender mod is crucial in countering this nuisance and losing it to a 15-second cooldown is detrimental.
While the World Tier glitch was game breaking, there aren't any other problems that prevent players from enjoying The Division 2 so far, and there are no reports of an influx of plastic bricks that used to be PlayStation 4 consoles due to running the game on them.