It should be about the law, not about politics. They're supposed to put that stuff aside when they take a legal office. Trias politica and all.
https://www.law.uchicago.edu/news/justice-ruth-bader-ginsbur...
This is a very misleading reading of that critique.
Ginsburg would've preferred the right to abortion be established a) explicitly a right of women, not a right of doctors to practice and b) via many incremental decisions, making reversal harder.
Practical critique; not "bad law", but "not secure enough to trust". As the recent decision demonstrates quite effectively.