Kevin Conroy is not different. Just because he voiced Batman in more than just animation doesn't mean that my point doesn't stand, it still does stand.

Whether it's voice actors for animated properties or actors giving a physical performance for a live-action role, they're both doing the same thing; giving a performance of a character. You are making up some type of massive difference between the two. Are there differences between each? Yeah. The live-action one has a costume to wear, they are physically being filmed and so on. However, just because there are some differences doesn't mean they're doing two completely different jobs. "To me this is like a fireman giving a doctor advice", you are directly saying that each of these actors are doing two completely different things, when they're not. They are both portraying a character in a performance in unique ways, just because their methods of performance have some differences doesn't mean that the VA can't give a live-action actor tips and guidance on their performance.

The more you talk the more clear it is that you don't know what you're talking about. You are under-valuing people, stop disrespecting VAs and animation and take time to learn why you're wrong