The problem with it being anti-Sono.
As one of the few reviews of this film stated on here (the one that happened to be on the front-page for me) the film is very anti-Sono in being less over-the-top and obscene in its content. I don't have a problem with the deviation from the norm merely on the basis of things but instead, Be Sure To Share seems to highlight a particular issue with Sono's downfalls when diverges from what he's clearly good at. Sono's films are, at least to me, clearly interesting in their subversive qualities which lend to their criticisms (usually of society and cultural life in Japan). There's clearly substance in his stylistic choices and this extends to what he typically portrays throughout the narrative.
Be Sure To Share is clearly Sono in restrained-mode but in almost all ways it ends up shallow. It's got a misplaced made-for-TV vibe about it coupled with a story that too is more befitting of daytime TV. In being anti-Sono, the film ends up very dry and lacking in any style at all to the point where it is awkward. The story has a message it wants to convey - which is kind of the only thing that makes it feel Sono-esque at all - but it's a very dull film all things considered.
Himizu showed that Sono can make social-dramas which don't end up in fever-dream madness or eclectic idiosyncrasy so he doesn't have to be one-dimensional all things considered. Perhaps it is best compared to that film then rather than any others then and Be Sure To Share still stands out as feeling pretty uninspired. At times Be Sure To Share seems like an exercise in Sono showing how uninteresting his films can be. Almost like somebody got pissed off at the weirdness of his movies and dared him to make a film which could be as lacking in Sono-esque tropes as it could be.
This isn't an attempt to belittle anybody who liked the film but I wonder if anybody felt anything similar.