Understanding the Constitution: Can the 25th amendment be used to remove Biden?

The 25th amendment is seriously ambiguous. It creates uncertainties that discourage using its procedure.
Hopes of using 25th Amendment against Trump are delusional

Trump-haters . . . should fix their hopes on impeachment, not on the 25th Amendment. For impeachment, though, you need a proven crime or a real breach of fiduciary duty. . . . Blind hatred and unproved allegations don’t count.