Biden has praised (WAY more than once and not in the distant past, recently) working with Republicans and even Segregationists, yet he and his team refuse to work with Sanders' team on his ridiculous "task force" or Sanders' supporters and other progressive leaning groups.
This may not seem like much to those who support Biden, but this is going to hurt him.
I usually agree with you but not this time. Here is a link to the Biden-Sanders Unity Taskforce Recommendations. I read it and concluded there are many compromises which create the most progressive policy platform since FDR. Have you read it? This documented evidence incorporates a lot of Sanders' and Warren's ideas.
You are talking about the most diverse and complicated political party in the history of politics. It is always this way in this party. The far left of this party is starting to mimic the far right. Their "my way or no way" attitude is childish and not how democracy works. It won't hurt Biden. Whatever small number of Progressives do the old "watch this, fuck me" vote will not be enough to negate the Republican crossover vote or the voters, some 100,000,000 folks, who were eligible but did not vote in 2016 who are suffering from Trump fatigue.This election will not be close. It is the Senate I worry about.
I am still looking forward to the Democrats t do something really stupid and give the presidency back to the cheeto. I do think the Senate will turn Democrat so he can be impeached again and removed from office. Once this is done the VP can be impeached and the Speaker of the House allowed to be president. Then the shit show can start and we can get these people into the jail they deserve.