2016 had the DNC force a terrible candidate down our throats because the establishment was more concerned in measuring offices in the West Wing that listening to voters. It was a spectacular failure and we got Trump as a result. The DNC did their utmost to ensure people didn't get a voice in the process.
2020 was unique for many reasons. Many, including me, said choosing Biden was a bad idea. He was even then so old that the DNC was giving up the incumbents advantage in 2024, partly driven by Biden alluding to him not wanting to run for re-election. Did the people choose Biden? Well, not really. Jim Clyburn did [1].
People didn't choose Biden's "bearhug strategy". Biden, against all the cries not to, decided to seek re-election despite showing signs of cognitive decline a year ago. So there was no real primary process, no chance for the people to have a voice. The people also didn't choose for the DNC to burn to the ground young voter support (eg college protest response), the Arab-American vote (ie Gaza) or the Latino vote (with an immigration policy to the right of Ronald Reagan).
If the DNC had listened to the voters, Bernie Sanders would've handily beat Donald Trump in 2016 and we wouldn't be here.