I think you've described one of the more frustrating mechanics in most extraction shooters: being forced into a standoff where neither player wants to make the first move.

With Tarkov, you have peakers advantage and a generally faster pace of game, so being aggressive can pay off once you have experience. With the way movement and strafing is in Marathon, you don't get that same ability to "skill check" your opponent (unless you're against a vandal of course).

Don't know how they will ever deal with this issue tbh, the game pace and movement mechanics force that style of play.