I also want to point out that Heal Scrappers currently do, also, have a powerful but small niche in pve. It's a little bit like boon thief, where it's only strong in very specific encounters. While in any encounter with enough chill/slowness, they can provide both permanent alacrity and quickness to a group. One place this works especially well is during the Deathbranded Shatterer fight, where the boss consistently pulses out slow, chill, and torment, converting into full alacrity, quickness, and might application.
If more encounters like this are added to the game in non-openworld fights, this niche could give it more space to prosper. Having built-in quickness added to it's kit in the patch will help fill in any potential downtime, with bosses being stunned etc. To make Scrapper feel more different to Healbrand, increased quickness/alacrity/protection duration (in pve only, I know it's already too strong in wvw) could make it even stronger in the right encounters. I know most people would hate this, but I would've loved to see a strike during the Icebrood Saga which had permeant pulsing chills applied to everyone for a significant segment; it would spice up rotations and builds a lot.