I agree. But mainly because I don't like that phrase even when it's spelled out. There are two variants.

"In my humble opinion" is usually an introduction to interminable bloviation, embodying the antithesis of humility.


"In my honest opinion" gives pause to the listener or reader. "Have his previously expressed opinions been something less?"


I don't have a problem with people changing their styles, per se. Hopefully we all learn new things. Hopefully we learn some things well enough that we can use them ourselves. But when the content of the message isn't consonant with the tone of the message, then it strikes me as insincere, almost sarcastic.


k