The 25thA was unnecessary and made things worse
Nonfeasance (failure to perform mandatory duties of office) and misfeasance (performing duties inappropriately without actual malice) through disability are High Misdemeanors which are impeachable offenses.
The fact that Edith Wilson got away with hiding Presidential incapacity either shows she hid it well enough that Congress didn’t know or couldn’t prove it, or that Congress was complicit.
The 25thA took what should have been an impeachment process where Congress would have power to require evidence and testimony etc. for hearings and a trial at its sole discretion and changed it to a process that could only be initiated by the President’s closest allies in the VP slot and the Cabinet, the very people who would be part of concealing the incapacity of the President.
The VP is the only one who might benefit from invoking the 25thA and there are many reasons to not do so, the cabinet members have nothing to gain and much to lose.
The 25thA does the exact opposite of what it was sold as doing, it fortifies Jill/Hunter in the Oval office.
Edith Wilson and a small group of aides kept everyone in the dark, not only Congress, but Vice President Thomas Marshall too.