Speaking about specifics, some of Bernie's left ideas that a moderate democrat may be opposed to include breaking up the big banks (Bernie demonizes the entire financial sector, but big banks aren't all bad for 'Joe America'. Lower interest rates, more liquid lending, etc...) and his opposition to trade agreements (and the fear of globalization. Protectionist policies suck)
Eh, these are somewhat complicated.
I don't think giant banks are a good thing in the grand scheme of things. I think the rise of credit, hell, the near reliance on it is ultimately a bad thing for "Joe America" and really a band aid for what is really just flat out less purchasing power for many people. I'd say that in a stronger economy people should only need credit for a large purchase like a car or house, for the United States I guess I'd have to add college but I'd rather that wasn't the case for most people
unless they chose an expensive college on purpose
despite having an option they could afford with no lending.
Demonizing the entire financial sector is not fair though, I'd agree with you on that. And really, some consolidation happened on behest of the government to keep some banks from failing outright during the crises and to then turn around and call out the banks that were nudged to buy those shit banks is rather harsh.
As for trade agreements, eh, that's complicated. Among nations of equal standards I'd say they're a good thing, when the nations have wildly different costs of living I think they're ultimately a bad thing. I don't really know how to define a protectionist policy in this regard because really, what isn't a protectionist policy? Or I guess I should ask,
who's being protected? Ultimately anything benefits somebody, what you consider a protectionist policy's benefits one group and not protecting them benefits another. If the country's outlook on people with low wages were better continuing to bleed jobs(or downward wage pressure) to other countries need not be a bad thing, the government could offset those losses in wages to people affected with increased benefits from the increased profits of those that do benefit from such policies but that's a hard sell in a country where some people get outraged that people under the poverty line even have a fucking refrigerator in their home or apartment.
But, all of this is fleeting in a way, the same jobs affected by globalization are the same ones that are going to get further gutted by increased automation in the future.