Webgl, despite what others might say, is a huge upgrade from the flashplayer. Playing on flash used to have strange quirks like how any gas bomb would make the game incredibly laggy or the firerate on some semi-automatic guns would be crazy high or the infuriating glitch where your avatar would randomly run a direction while fighting. Webgl also is a visual upgrade over flash, removing the annoying friend's list and increasing the resolution of the game. Webgl is such a straight up upgrade to flash, I believe anyone vouching for the flash player has never experienced playing on it to begin with or has limited experience with it, choosing to play on a phone. My only gripe with the web client is how poorly it runs, which would not be fixed if flash was reverted. However, I would still take the lower performance from webgl over playing on any mobile device, due to the controls on mobile relying on the touchpad, which I have never been a fan of.