The novel still sell well and even get manhwa adaptation, Korean reader probably love this kind of shit
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I get what you're saying, and I actually hate the miscommunication trope too. But the problem here is that even if they had talked, even if the MC had tried to confess his feelings to the ML in the first two or three chapters, I don't think it would have changed anything. The ML is literally an immature child who doesn't give a fuck about anyone, and you can't even deny that. He's fully aware of how he behaves, yet he doesn't actually do anything to change himself. That's literally his whole personality.
So even if the MC had communicated his feelings, I don't think the ML would have taken them seriously enough for anything to change. That's why I think something more drastic was needed to get through to him, something that would force him to understand the consequences of his actions. Sometimes, a person who is fully aware of their own flaws still refuses to change until they actually have to face the consequences of their behaviour. And I think that's exactly what the ML needed. He had to experience something that would finally make him understand how badly he'd been treating the MC and why his behaviour was wrong.
Honestly, I think this could have been handled in 20 chapters if the author had wanted to. But since miscommunication is the main trope, the author is obviously going to drag it out for 100 chapters instead.
How do you write a long love story involving two people who are already in love? Add in a bunch of misunderstanding, miscommunication, characters that refuse to communicate, and characters that have stunted emotional capacities. This story would have ended in 5 chapters if the characters are just being honest. One of my favorite BL has less than 30 chapters because the couple actually talk. When it ended, I wanted more. This one though, it's like a test of patience whether I can read it until the end. What a waste of the gorgeous art.