Married filing separately (MFS) tax brackets are just MFS divided by 2, which is worse than Individual tax brackets.

Also various things get cut in half e.g. SALT cap phase-out income limit, mortgage deduction limit that MFS is almost never worth it except in a few niche situations and it acts as a last resort option if you are no longer on speaking terms with your spouse but haven't divorced yet, yet need to file taxes for the year.