These single page a day manga must be incredibly taxing to the authors. Not only are they almost always plagued with often long and extended hiatuses, but now along with Tomo-chan, virtually every one of them has ended in an abrupt and unsatisfying manor. Almost as if the author has become so fed up with the grind that they are so glad to finally be done with the series that they don't care if the series has any sort of meaningful conclusion for it's characters, world, and story that so much time and effort went into crafting.
I think I am done reading these single page series'. It seems glaringly obvious to me that the burnout on these types of manga is very real, so much so that by the time the authors are exhausted and tired of milking status quo scenarios day after day to artificially prolong the life of the series in order to have a steady income. They begin to reach a point where they no longer care about the product they have produced enough to wrap up their own characters story's in a meaningful and satisfactory conclusion. Side-characters especially get the shaft as a labor of love becomes a labor of tedium and monotony.
Maybe it's more a problem with editors pushing for authors to create the next "One Piece" or "Conan" that they can continue to milk for profits for the next 8 years or so, that the authors lose sight of their vision for the series as the goalposts continue to shift. Perhaps that is why most authors aim for the confession ending to the point where it has become ridiculously cliche, as that way there is at least always an end in sight. Either way it's always sad to see a good series end terribly.