That is a very good point. There sure is benefits to knowing GTO strategies, and as you move up, you will need them more and more. But they are mostly a defensive measure against good opponents. If your opponents are bad, you want to figure out, what they do wrong and exploit them. This is the way to get a high winrate, which at the lower stakes you need to beat the rake and make it worth your time.
Not saying you have to go totally out of control, but you should certainly go for thinner value against the typical recreational player in the micros, who dont fold anything, and there is no point in trying to be balanced by "finding enough bluffs" and all that stuff. These opponents are playing for fun, and you dont need to prove to them, you can have bluffs in certain spots to make them call you down light later.
On the other side of the spectrum micro stakes games online also have many nitty and robotic regulars, who are usually playing a bunch of tables at the same time. In a lot of spots these guys just dont have any bluffs in their range, so there is no point in paying them off to "protect your range" or anything like that. Until they have proven, that they can 3-bet other hands than TT+ and AK, then just fold to their 3-bet, unless you also have one of those hands yourself, or maybe they make a sizing mistake and give you great
odds to setmine.
The biggest mistake, people make in micro and low stakes games, is to use the same strategy against everyone. You will be facing wildly different types of opponents, and the way to get ahead is to use different strategies against them. This is why, its so important to either use a HUD or take notes and also simply pay attention to, whats going on at your tables.