Aaq, this is why i said the vast majority of rishonim and achronim. The maskilim pick up on one rishon, rabbeinu Avrohom ben harambam, – from who we received basically no halachos or hashkofos in the mesoros of ashkenazim, sefardim, etc.. – and made it into a valid shitah after it was rejected by the halachik process. In shabbos, you can’t dig up a rishon and follow it for halacha lemaysoh; heresy is a halacha too. Just as there are shitos in the ralbag which we pasken are apikorsus, there is a shitah of rabbeinu Avrohom – rishon and tzadik as he was – that we paskened against hundreds of years ago.
Halacha and hashkofa have a process and a mesorah. You can’t make up stuff on your own or think you know what chazal meant when the halacha is that we are obligated to believe that they did not err in scientific issues.
The fact that you supposedly read rav meiselman’s sefer and your takeaway was “well, rabbeinu Avrohom!” Means either you didn’t read it snd see the long, long list of those who disagreed, or you’re intentionally ignoring his message.