Especially because lowering the barrier usually means getting more low effort application.
People either put a lot of effort on few applications and invest significant amount of time in each one hoping to increase the chance they get picked up; or they put a lot of effort on reaching out as much as possible, knowing they have a very small chance on each application but playing on volume.
Most recruiters are only interested in the first category of candidates. Having a long initial process is a feature. The goal is that the second category considers that given their chance of getting picked up, it's not worth filling the form.