I used this y carrier which reduces weight --added back in with my 4mm glass bed: https://m.ebay.com/itm/Y-Axis-Carria...0.Xwanhao.TRS0
As long as you have good idlers, your belt is tensioned correctly (without a sprung tensioner) and your speed/ jerk settings are right I don't see an issue with the "bedslinger" design. I don't love Bowden tube designs and any direct design is going to have a bit of mass. I guess it depends on what you're trying to accomplish, but I can print almost as well as a raise3d printer, but it takes me a lot more set-up and print time.