Logitech China even has an official tip on why G403 users can't draw a horizontal line.
I believe G403 is not the only mouse that would have this problem. If one is using IE3.0, he's likely to have the same experience.
It's just that G403 is so hyped. People have really high expectation of it.
So many people put interests and attention into it. So many bought it even if they never handled a gaming mouse before.
People notice some issues on G403 and yelling around every forum, saying they are cheated by Logitech.
It's just because they never really paid attention to a mouse like they did to G403. It's not G403 having the issues.
Manage to run your games at 300+fps before you talk about mouse precision.
If you are still struggling to reach 100fps or if you are using some IPS/VA monitor, don' buy mice anymore. Save money and upgrade your whole rig.
If you don't know how to upgrade, just throw away your Ryzen 1st and 2nd gen, get latest Intel i7 i9 with "K", get 4000+MHz memory.