I believe the time to charge it at first is actually 0.7 seconds, which means it is impossible to do a combo faster than you can charge it for the first charge for 4-step combos, and it would be pretty hard to beat that time on a 3-step combo. You should probably wait and test the mechanic before you decide if you like it or not.

Also, again, the point of this mechanic is not necessarily to say “Warriors will never need to do combos anymore”. It’s so that when you’re just doing trash pulls, or grinding, etc., you can relax a little more and do the charge move instead. If you are doing a really tough boss fight where every single DPS matters, it may or may not be useful (although I think the way the math works, it’s still useful to do one charge between combos assuming you were going to do the same combo again).