The DNC completely restructured their convention process after this happened. Sanders and his supporters fought hard for this change, at least try to pay attention:
Adoption of superdelegate reform (2018)
On August 25, 2018, the DNC approved a plan to reduce the influence of superdelegates by barring them from voting on the first ballot at the Democratic National Convention, allowing them to vote only in a contested convention (i.e., if a Democratic National Convention did not choose the nominee on the first ballot, because no candidate received an absolute majority (more than 50%) of the pledged delegates elected from the outcome of primaries and caucuses). This does not preclude superdelegates from publicly endorsing a candidate of their choosing before the convention.
this has nothing to do with how they structured the primary, favoring hilary with party resources. they chose hilary long before the first superdelegate vote.