The point is that focusing on a voice or a stutter is not his platform

His platform is bad. He's a conservative Democrat who has governed in line with the Bush/Cheney era. From automotive subsidies/bailouts and protectionist tariffs to overpolicing and warmongering abroad and migrant criminalization to privatization of public utilities, he's been very bad for the country as a whole.

That's his platform. It's not good.

Keeping trump out of the Whitehouse is all that matters

Keeping Trump out isn't a policy. Hell, it isn't even part of Biden's platform. Biden had four years to prosecute Trump and failed to do so. He put more effort into prosecuting Assange than Trump, ffs.