Goats exists because of healing and shields.
The reason goats exists is because there are comps of TANK and SUPPORT in which the whole team has so much survivability everyone can survive until ULTs come online. You combine this with Lucio and his speed boost and you can simply run people down or bully them off the point.
If it was because of a DPS increase the opposite would be happening. People would be dieing sooner which is not the case