Torah lishma is your intention, not your methodology. Shmaitsa aliba dehilchasa is the mesorah; you’re conflating methodology with intention.
Alwaysaskquestions – if you want to have a serious conversation, leave out haskalah-driven analysis of rishonim. There’s no practical difference between the Rosh, baalei tosfos, the Rif and the Rambam. Shulchan aruch gave them practically equal consideration, as should we.
Imagine the magen avrohom sitting and thinking… let’s pasken like the rambam because his views sometimes have a analogs with in vogue rationalism! Brilliant idea!