David Ross has certainly not had an easy time as Cubs manager.
In his first year, the season was shortened to 60 games by the COVID-19 pandemic. Even so, the Cubs won the NL Central, before being dispatched quickly in the postseason.
In his second year, the Cubs ran out to a division lead and appeared to be contenders, then utterly collapsed with an 11-game losing streak and then the team’s best players were all traded away.
Thus I don’t think Ross has ever really had a chance to show how well he could manage a baseball team under “normal” circumstances.