This is honestly a really shit take. By your standards, the MC also shouldn't have any dialogue, because it isn't what you would have said. It's clear you have a fundamental misunderstanding of how writing a character works, so in the hopes of helping you understand, YOU are not the MC. The MC is a character the author has created, and the internal dialogue exists to help you understand and immerse yourself in the character, not transform the character into you.
Let me give you a very basic example of why it's important. Let's say there's a situation where the MC and a female character are on the verge of engaging in some sort of sexual activity. Maybe you as the reader would just rip off her clothes and go to town. However, the author chose to have the MC play hard to get and tease the female character a bit to push her into taking the lead but doesn't want her to know. So the author has the MC say "It's getting really late. I should probably head home." So you're sitting there like "what the fuck? Is he an idiot? She obviously wants it." Without an internal dialogue of the MC thinking about teasing her, you would have no idea why the MC said he was going to leave.
That being said, I do understand where you're coming from. You want to imagine the MC is you, but that just doesn't really work in VNs. My suggestion is wait a few more years, and through the use of AI it's likely that authors will be able to write the basic outline of a story and allow you to choose exactly what you would say or do while the AI generates responses that fall in line with the story outline the author gave it.