One rishon holds “potrin oso miyad” by the case where every member of sanhedrin convicts by a chiyuv misa, that it means we kill him right away. The komarna rebbe in shulchan hatahor says that safek brachos lehakel means to make a bracha. Do we deal with those shitos in lractice? Not really. If there is such a malbim (source please?) It’s not what the rishonim on the gemara say, and it’s not pashut pshat. We wouldn’t use it to dismiss the idea of the gemara since it’s echoed elsewhere.
Also, rashi on mitzvos laav lehanos nitnu can fit – he’s not (nor is the gemara on that sugya) addressing abstract feelings, but rather hanaah in the context of every case in the gemara, which refers to physical benefit.
Rand’s theories on ethics and morals have as much place in a beis medrash as zeus and hercules