I strongly disagree with this statement. As a pretty casual player I didn't even know third party addons for builds existed and I felt pretty neutral regarding this build template feature. But since it went live it became clear that it is a huge step backwards (apart from the constant crashes even after 3 additional patches). I usually play PVE and a bit of WvW and would have been perfectly fine if what I had stayed the way it is. But hey - now my WvW build is gone and I realize they did not "gift" 3 build slots, they replaced the build choices we had for PVE and WVW with this new system and guess what - it also doesn't automatically switch anymore when you go between PVE, PVP and WvW. So I am now expected to use these new templates and manually switch them every time I want to play the other game mode? How can you call that a "boon"? We had the same 3 build templates before and they automatically switched between game modes, now that's what I call a feature. But maybe that is something that is planned to come in the future as a gem store addon, you'd never know.
I've had quite fun playing this game before the update and didn't really care about this build template system. I was fine with what we had, but now not having builds switch automatically between PvE/WvW/PvP anymore makes it less fun, so I figured I leave a comment to let you know since you are asking for feedback. Edit: I would be fine with the system if we could at least permanently assign one template to each game mode and have the game automatically swap to it when changing game modes. At least that is the functionality we had in the past but what we got now is just a straight downgrade.