Actually, the G2 had full leather strap accessory kit (knee and calf straps too). I went to Warrior when the G2's came out. IMO, the best pads ever made at the time. But the G2's biggest flaw was the strapping. It had standard elastic straps (something like 1.5-2" thick) but it wouldn't hold my leg in the channel and my knee kept coming off the knee block. Also, I had a lot of problems with my supplemental knee pads catching on the knee block. At least in my case, getting the leather straps was mandatory, I strapped them loosely just to use as "limiting" straps to make sure my leg stayed in the channel.
Then the G3's came out, and even though my G2's were just a little over 1 year old, I didn't blink an eye to upgrade. The strapping on the G3's (that single super wide triangle strap that they still have today) is perfect. The knee strap also has a built in nylon limiting strap too. For some reason, I stopped having knee pad binding issues too.
IMO, the innovative Warrior "toe" straps are another no brainer. I assumed all goalie pads would use that design, but I guess I was wrong. To my surprise, I see a lot of people don't like them. I've torn my MCL twice while playing - I attribute it partially to using classic toe ties. I find Warriors elastic straps (one goes under your skate toe and the other I choose to go through my skate's Lundy loop) are genius and work perfectly - perfect pad rotation - zero leg stress.
But the G4's and G5's have given me no reason to upgrade. Hoping the G6's can do better.