It seems to me that many, including myself recently, are applying this "extreme contrast" rule to the wrong cases. (See #2 in link below.) https://owl.purdue.edu/owl/general_writing/punctuation/commas/extended_rules_for_commas.html
Specifically, I mean...you can't put a single comma between the two verbs of a compound predicate just because the second one follows "but" and seems 'extremely contrasty' (more than "but" can handle alone?), can you? That's comma abuse according to the link above. (See #13.)
Basically, I was taught rules like the ones in these links: https://writingcenter.unc.edu/tips-and-tools/commas/ https://www.grammarly.com/blog/comma-before-but/
But, I thought they might be outdated, so I started...abusing commas, I think, like in a recent comment I made:
That's what I was thinking, but couldn't articulate--the "or" being inclusive...
That doesn't seem correct to me...most of the time, and this is definitely wrong...I think:
I tried, but couldn't do it.
But, for whatever reason, I have no problem at all with this:
I tried and tried, but couldn't.
Clearly, I'm confused about it now (i.e. what's modern vs. what's just wrong). I couldn't find a similar context (concerning rule #13 as stated above) in the 40+ questions on this site (concerning a comma before "but"), so thanks in advance if you can help with this. Good evening.