Don't worry, that's what most people do on forums.
I made a
similar post on the general discussion forum. One of the replies said it would desync party buffs... which... if they would've read the very f*ckin first sentence of my OP would not happen... and their post is the most upvoted... nobody reads your post, just the title and don't bother. It's sad, you want to start a discussion and they don't even read your statement.
Anyway, I get you, and agree that SkS should also affect 'weaponskill-oGCDs' like Blasting Zone. Similar - if not the same - as Empyreal Arrow pre-ShB.
And for all the other naysayer: No, it will NOT be worse, on the contrary.
B/c Blasting Zone as an ability clips everytime it's ready, it desyncs on its own. After 5-6 mins it will desync by ~10s. It's not much, but noticeable. And it from there on onward, it will not fit into Trick Attack anymore, and soon not in Chain or Divination neither.
Blasting Zone as a weaponskill-oGCD like pre-ShB Empyreal Arrow will always fit into your own and the parties' buff windows. If it desyncs with your buff windows it's your own fault, just like it's your own fault when Gnashing Fang desyncs.
If BZ becomes a weaponskill-oGCD, you'll have control over BZ and GF getting out of sync from your party buffs. Right now - BZ as normal ability - you have no control over this!