There is no drawback, per se, but there is the opportunity for confusion among less educated, possibly newer users. It is essential for the RAMP test to be the same each and every time, and by having different options for extending warm-up, it can be a challenge to properly educate our users and ensure that their first experience is simple and easy.
By simplifying the test it makes for an easier first experience, while also allowing more advanced users to extend their warm-up manually once they have determined that that is what they want to do 