I dont know what the root harvesting is like in lower tiers since I havent harvested below T7 in a long while, but in T7, roots are plentiful. There are several spots with high concentrations of roots that only repop as roots. Even with a couple other people harvesting in the same area I can get hundreds of roots in an hour. So I hope they fix lower tiers for any of you having problems, but know that it is much better T7.