This post doesn't really contribute anything new to the conversation that has been happening for weeks now and if you want to come out and say something, just say it.
In your first point you say "GPA is a nonsense metric" and then in your last paragraph "To be clear, I think grades should absolutely be considered and in many ways could be more relevant than LSAT score".
Pick a side dude.
Counterpoint to Point 1. GPA is not a nonsense metric. Furthermore, I would wager no more than 10% of law school students altered their major and went to GPA inflating schools because they knew about the law school admissions process as a 17 or 18 year old when they were picking a college.
Counterpoint to Point 2: This is a silly situation that also has an easy answer. Not many undergraduate pre-law advisors are going to be telling a student with a 2.5 GPA that they have a great shot at admission without taking a gap year or waiting for their final GPA to post to LSAC before moving through the admission process. Excelling on your LSAT but shitting the bed with your GPA as an applicant makes you look bad regardless. Admissions is a holistic process. Learning how to game a test doesn't make you a successful applicant.
Counterpoint to Point 3. Data shows the LSAT correlates best with 1L GPA. LSAC also has a vested interest in this research and its results. I won't say you are incorrect besides mischaracterizing the research, but I am taking this point with a grain of salt. Furthermore, I recognize that law school is exam-based. However, no law school exam is remotely close to the LSAT. Atleast the ACT and SAT are measuring things that a student may encounter at 99% of universities.
Counterpoint to Point 4. GPA calculates how you in courses for a minimum of 3 years in various subjects. The LSAT calculates how well you do on 3 specific types of tasks over a 3 hour period. Furthermore, schools do not want to see you have 3 different LSAT scores. I would say in most cases you have a 2 chances to make it happen, regardless of circumstances.
At least I can recognize that neither of us are changing any minds today.