This has become just stupidity to continue to allow this bs after promising to address it 2 seasons ago. Its pathetic and a crutch and has NOTHING to do with being a competitive player. A REAL competitive player wants to engage ither players not hide like a little $&#^&×. Its just cheap bs.
Invis did get addressed, they nerfed the radar range to where if an enemy is on the other side of a wall and you're invisible, they don't show up on the radar. If they see you, it's either because they seen you by "information gathering" which is a technique that a lot of high tier players use, or you got called out by their teammate.
Also if you're having trouble tracking them, that was also fixed so aim assist WILL track them, but not an absurd amount like controller aim assist.
And finally, if you're having trouble seeing them, that's normal.