It does not imply you disagree with species unless you explicitly disagree. You’re assuming an intent that is not intrinsic to just posting a genus after a species. :)
And as has been posted above, nonexplicit disagreements don’t override species IDs when they are on the same branch.
If we’re going to assign a motive, the safe assumption is that nonexplicit disagreements are either only going to the level they are comfortable with, or are that weird glitch where the system keeps auto-adding previous agreements.
While I’ve specifically taken to adding text, because many people make that assumption, I don’t think it’s fair to expect that of anyone else everytime they go to a higher taxon without explicitly disagreeing.
https://www.inaturalist.org/observations/8561618
https://www.inaturalist.org/observations/18414653
https://www.inaturalist.org/observations/18015335