Follow the money. Do you know what Burisma was being investigated for? Tax evasion. You don't think Hunter's 50k/mth salary would have come under scrutiny during this investigation? You don't think that could have upset the sweet deal the Biden's had going? Get real.
Not really, since the tax evasion happened before Hunter was hired.
Hunter's FIRM was hired to correct Bursima's international business issues and corporate best practices... something companies do all the time, they bring in consultants to tell people how to do their jobs. (I Personally have no use for consultants, but they are a reality of modern corporate life.)
One more time- It really doesn't matter what Hunter did or didn't do. Trump broke the law by using federal funds to get the Ukraine to slime Biden.
If they didn't, he should have NO PROBLEM letting Bolton and all the other actors testify under oath.