Great points. One small issue though, do you create art just for public recognition? What exactly are you doing with your life if you spend 100+ hours a week working for an abusive bosss, on projects you've started to hate, with all of your friends walking away, and awards that bring no change to your mood?
What I'm trying to say is, Koichi looks incredibly stressed and unhappy. A far cry from what he looked like when he got into art. Eren was infuriated by his smiling face as he put out mediocre art, but she only came back when she felt the freedom of individual expression (sunrise, that mentor, etc.). Koichi looks haunted and about as far from freedom as you can get.
To take it to an extreme for a second, if Koichi committed s**cide tomorrow, would this still be a rightful path? Cause the man looks miserable.
He has grown jaded and spiteful of how the art world works, and of the things he has to do, but if you remember last chapter for all the grievances he had with Yanagi, his abusive boss, what hurt him the most was to admit that at the end of the day the guy had the talent and drive to back up his harshness with results, it is why his senpai was unable to talk back to him, because he also had to begrudgingly admit that their boss who is an asshole had a good eye for design, it is a Gordon Ramsay kind of deal, he is total dick but... he is right
And is not like he was happy with his life before he got to this point, he was about to quit already, his life has been rolling downhill for a while, being a summation of failures, and he had nothing to show for it, he has been in a bad place for a while and no one really cared until now, Micchan has always looked down and pitied him, she never really cared about him, and always saw him as an unreliable man, so wathever opinion she may have formed now out of his outward mental state is to be taken with a truck of salt
Also lets talk about his previous boss Kamiya, the previous superstar of the company, before this current arc Koichi had a small story arc from chapters 7 to 12, it technically starts at the end of chapter 6, it is about Koichi adjusting to the fact that more than an artist he is a salaryman, and that before pursuing dreams and ideals he should just fall in line and do his job, it is his dreamer attitude that has he enter conflict with other departments, his bosses, and colleges, and it is why his peers and other female staff members Micchan included look down on him
So how does that arc end? it ends with Kamiya admonishing Koichi infront of everyone, i a very very Gordon Ramsay manner at that, he starts with singling him out, saying that he contributed minimal next to nothing to their project, practically calls him a parasite, humilliates him in front of everyone, dismisses his ideals as childish, and then tries to save it all up by saying that what is holding him back is that he doesn't believes in himself and that his mediocrity is due to a lack of effort and self confidence
Kamiya out of all people would be happy to see this current version of Koichi, because... lets now go a bit forward to chapter 22, we learned that deep down both Yanagi and Kamiya are the same kind of creatives, the only thing that change is how they handle people, but deep down they share the same core believes about how to make art, which is why in the first place Kamiya left his team and pursued a succesful global solo career
The dream of an era of teams died when Kamiya left Koichi, and he could have ended up a nobody, but Yanagi pushed him around to where he is now
And he looks jaded, but he his dreams have been getting killed when he was a kid, his dream of being an artistic genius died, when he was a young adult his dream of being more than a worker but a creative died, and then his dream of being a teamplayer died when Kamiya left him with Yanagi, however this is the first time that he is getting something in return, because he never really got to hear Eren giving him any praise or validation, she keep those words for herself
But more importantly than any of that, we don't know if he hates the art that he is making with his hard work, for all we know the only thing that could have faded is the ideals he had around how to make art, and the value of team works, not the art that is being made itself