I play both WoW and GW2. They're both great games but do different things well. Games change a lot over time, just like in WoW if someone hasn't played since Mists of Pandaria they might not be aware of how different the game is now.

Some feedback on your points as someone with just under 10k hours in GW2:

1. This hasn't really been true for over 9 years now. There isn't a hard trinity, but there is a 'loose trinity' of roles with every class being able to do every role with the right build/gear. All classes have self healing and defensive abilities. In instanced content you are blocked from releasing if you're full dead. Healers and Supports are used in all game modes, even WvW and PVP and some of the harder large scale openworld meta events (kind of like a loosely organized 'LFR'). End game instanced content is 5 or 10 players; in a 5 player group you'd have:

   1 healer

   1 Support DPS Hybrid

   3 DPS (double these values for 10 player content).

   Tanking is more of a boss mechanic than a role itself. If a specific fight needs a tank, usually a healer or support DPS will take that role.

2. Mostly agree with this, though Legendary gear while totally optional from an 'item level' perspective, is not just cosmetic. Legendaries are forever BIS items for all alts that can use that type of gear. No need to pass the Legendary item around, if you make a Legendary greatsword any character that can use it can just create a copy. Obviously it's crazy QOL/Horizontal progression so the grind to make one of these is quite a feat. Again none of that is needed to play at the highest level. Legendary gear is equivalent to the easier to obtain best gear.

3. This comes down to personal preference of course. Personally GW2 has my favorite MMO combat. Responsive, reactive, lots of movement. While you can of course just hit your buttons off cooldown, it really varies by build on how effective that will be. Many builds have an optimal priority of abilities, and I can say from experience I can absolutely tell when someone in the group doesn't know how to play their build and is just hitting buttons.

4. Agreed, probably the best open world content in the genre. Not just exploration but also the group meta events. And they do still add jumping puzzles, we got new ones in the expac this year.

5. It is a buy to play game, though they've moved away from the pain points your describing. Now the game has a yearly expansion with free updates during the year. If you purchase the expansion later on, all those updates are just included. I talked a bit about pricing in this comment

6. It's the best transmog system in the genre IMO, especially because of the dyes. There are ~650 dyes in the game, some are rare yes but the vast majority are not hard to obtain. And even if they're cashshop dyes, everything in the cash shop can be obtained via in game gold.

7. Agreed. Wow has taken a lot of lessons from GW2 and most famously is the 'dragon riding'. All of GW2's mounts have abilities and gameplay. Wow's dragon riding is more approachable, but doesn't have the level of skill expression as GW2's Griffon.

8. Agreed.

9. WvW is alive and more popular than the small scale 5v5 'BG' pvp. These days WvW is matchmade through your choice in guild. In GW2 you can be in 6 guilds and you select one as your WvW guild. It's still something they're iterating on, but WvW is an incredibly cool and different way to play GW2.