I think, if there's a planned continuation, this "ending" is fine, in the sense that it feels like a cliffhanger for a second season. Like, the ending for 2013's Dracula is fine if they would've gotten a second season, but it being cancelled means that there were too many new plot elements that were never tied up.
If this isn't an ending made with the idea that there's a definite sequel, then yeah, it's bad. Imagine if Assassin's Creed ended after the first game? There's a major plot event introduced and not done anything with, and we have no idea why Keiko is even moving out, or what happened with her ex. There's too much beginning and not enough actually resolved.
Invoking "real life" to justify it is also pretty stupid. It's not real life. It's a work of fiction. Writers should always bear in mind that, if they adhered to true realism at the complete expense of writing a story, what they wrote is going to be terrible. Nobody is looking to read a Facebook wall of irrelevant crap; they want to read relevant events that tie together into a cohesive narrative that's entertaining to read.
There's a reason Shou didn't detail every single thing that happened in their day-to-day lives, such as going to work or going to shop for the groceries each week, and that reason is because it wouldn't make a good story. Why make allowances for a terrible ending that goes nowhere and does nothing?
tl;dr It's a good move if there's a sequel. Terrible one if not.
