Then by your definition, no skill in the game is spammable since it a 2.5 second baseline recast for literally everything thats on the global recast.
Split Shot is spammable in that it does not require a previous shot to do its full potency.
It is very much an analogue to Bards Heavy Shot. Its the skill you cast a over and over unless something else is proccing, like a Slug/Clean Shot or GR/HG is ready.
I've said this a few times, but it bears repeating until people get it.
An instant weaponskill is deals damage and then waits 2,5 seconds to do anything else
A 1.5 second cast speed weaponskill does damage after 1.5 seconds, however you STILL must wait out the remainder of the global recast that began when you initiated the weaponskill, so you have a full 1 second in which to determine if something procced, check Buff/debuff durations, cooldown readiness and use off global shots.
The only thing you might otherwise do without GB or WM on is Auto Attack. But Autos are weak and a flat 20% damage buff to every shot you use more than makes up for it, especially since the only shots you ever actually have to cast are Hot/Lead/Split. You dont use Slug or Clean without the Ammo, which makes them instant.
So not using Gauss Barrel causes you to deal less damage with your main combo as well as cutting damage done from Lead Shots DoT AND losing Gauss Round.
Yes, RNG absolutely can kick us in the teeth sometimes. I will not and cannot deny that. But with proper use of Reload timings and damage buffs, you can limit the impact of not getting your procs.
Maybe we'll get some buffs, i wont complain if we do, but i am sick of people making threads about the casts are somehow destroying our DPS.
Its a Job that rewards playing well and is very noticeable when you are not.
PS: Quick Reload is 30 seconds and Reload is 60. Theres 30 seconds of downtime after using a Reload before its ready again, Provided you're using the time between shots on off globals and activating damage buffs.
If you're in a situation where you simply cannot get the opportunity to stand still for a moment, Then dropping the WM/GB until you re-position properly is probably what the devs intended. Then again, For MCH, if you know such a phase is coming, you can mitigate slightly by using Rapid Fire to make Split Shot instant so you can pop a couple of those off while moving.