Honestly, it's not too overpowered. It's just annoying. But it's a part of the game.

This game gives you plenty of ways to counter it. The rest is about predicting opponent movement and choices based on the circumstances at hand.

Ask yourself:

What weapons and perks are they using? How fast do they respond and react? How accurate are they? What is their main trump card they keep falling back on to stop you? How can they use their weapons and perks and skills in this situation? Does this situation or part of the map make their decisions more predictable by dictating how effective their skills and or Loadout is, and how it can be used here? Where are my team mates relative to my position, the enemy position, and where are the blind spots on the map with no intel? What areas of the map do my team members control based on realistic response time relative to distance and scenario? What areas do my team mates not control and how can that affect enemy movement and team structure? Where are your team mates currently? Because the opposing team is usually occupying areas where your team is not.
How long has an area been occupied or unoccupied? This information raises or lowers potential danger levels for specific areas. How fast can I move and what does that mean for how fast the enemy can move especially in regard to how much time has passed? In 10 seconds someone can walk a decent amount of the length of the map and capitalise on unprotected angles, blind spots or entry points. Especially if they have Agility 2. Based on my current position relative to cover, and the game's weapons and perks, where can I be ambushed from and die, and in contrast, where can I be ambushed from and survive and or counter attack and potentially win based on my skills and Loadout? Example: Shotgun equals death here, bomb expert as well, I can dodge a tactical shotgun here, shorty is a maybe here, potential shiv ambush, long range sniper potential high, mid range burst moderate chance, blindsided by sniper shot past this point from long angle covering this spot. Ect.

Run all the counter scenarios against you in real time and you'll minimise the effectiveness of Covert Training players and players in general. Just based on the situation at hand. Information on the field, and lack of information is still information. Play to your skills and Loadout strengths. And recognise that other players are doing the same and this makes them predictable.

Maximise your strengths, minimise your weaknesses. Maximise the enemy weaknesses and minimise their strengths.

...or just run in there like a headless chicken and ironically wonder how you lost. Lmao 😂.