Surely you can start using Gto ranges from solvers. The issue is, if you want to use postflop ranges from solver, you need to use preflop ranges as well from solver, otherwise it makes no sense. This means you can't make any preflop or postflop adjustments.
The issue with having to use only gto solver ranges, is that you need a solution when opponent starts using non standard bet sizes. E.g. solver will assume e.g. 2.5 big blinds raise from CO, and then e.g. if you are big blind, you use cold call range from solver. But what if opponent uses 4 big blinds, or even 6 big blinds, in that case either you make own strategy which uses tighter preflop cold call ranges vs big sizes, and postflop again you have to use own strategy in such spots as you deviated from gto ranges, or you use gto ranges and burn money because you would call too loose vs big raise size. Similar is if opponent uses small bet size, you would play too tight if you use gto range. Similar is for postflop, if opponent uses e.g. overbet size, and you don't have a gto solution for that size. And in poker you get in such spots very often. So the solution would be to only use gto ranges in spots where bet sizes are the same as solver used to create ranges, and in all other spots to use own strategy. Also if you play against big fish, using gto ranges is going to result in much lower EV than exploitative play, and in poker the profit comes from big fish, that is how you can beat the rake.
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