I do have some cons, for one, the first half was pretty weak. It was really preachy (well, the whole episode was a bit preachy anyways but it was more apparent in the first half) and the bullies confused me once more on the Kizna concept. Second half was better. Visuals on the bridge scene was great, and the OST continued to be really interesting and helped maintain the mood for a lot of the scenes. I still thought the dialogue was preachy as hell, but I kind of liked the idea of it.
I have a problem with how clean the ending was as well, since Sonozaki caused a pretty widespread panic, and she just let go of like...sixteen years of singular pain and there's no real consequence at all. There wasn't even really a consequence at all in the end of this. Not that I don't like happy endings, but for the situation, I thought it was way to clean. I don't think they had the time to wrap this up as well as they wanted to with 12 episodes, maybe this would have benefited from an extra 13th episode but I feel like that would have made the finale too slow.
I still don't care about Sonozaki, nor that sudden gain in emotion at the end of the episode, so naturally this episode felt weaker than it should have because I still think Sonozaki is a weak character. Hisomu disappointingly was not developed as well. Throughout the show, he clearly had more of a straight-head when it came to terms with relationships, so I don't think he developed at all. His masochism went thoroughly unexplained, and he was just a weak character in general.
The development for some of the cast was actually...kind of weak. They all "developed" in the sense that they got a sense of empathy (I find it hard to believe that these guys lived without the concept of empathy, which is something else that went completely unexplained, but whatever) but they haven't really significantly changed attitudes. Chidori kind of got "less selfish," Tenga kind of...stayed Tenga, Hisomu had no room to develop...The development was relatively strong with the other three though. Nico is probably the best character IMO, and Honoka/Yuta probably got the most development (Honoka got a whole arc dedicated to her...lucky for her character.) Speaking of which, Honoka and Yuta probably had my favorite interactions throughout the show. Even their little quip at the end was funny.
And I gave up at the overarching plot they established at the beginning of the show. I think it's weak to build up a monumental experimental plot like that and completely drop it for character interaction, but whatever.