The centrists for the most part don’t do this. Instead, they act and speak like people who’ve spent too much time in meetings with political consultants, professional strategists, pollsters, and data crunchers. There’s nothing wrong with the people who do this work, and all candidates (including Sanders) employ them. But a political party and its leading candidates should never defer to the consultants and strategists when it comes to deciding what their core message should be.
Do the Democrats want to continue embracing neoliberalism? Then its candidates should make the case for those policies forthrightly and without apology, explaining to voters in an inspiring way why they are best for the country and its people. What the party should not do is continue to propose neoliberal policies because it thinks that’s the best Democrats can hope for given constraints imposed by Republicans.