You say no evidence and I say no evidence presented as of YET!!! Therein lies the difference. You agreed the optics are bad. Why are they bad in your opinion?There's a lot of problems with this accusation.
1. Can't turn a blind eye to something that isn't our job to prosecute. If Burisma made millions illegally, they did it in Ukraine and broke their laws.
2. There's no evidence the prosecutor was coming after Burisma.
3. There's no evidence Burisma asked Biden to do anything about the prosecutor.
4. There's extensive evidence in testimony under oath that the desire to have the prosecutor fired stemmed from State Dept officials who were upset with this prosecutor being entirely corrupt.
Not only is there no evidence for the accusation, there's considerable evidence against it.