Report showed how that was true. The "SD" was started by Republicans to get dirt on Trump...taken over by Dems once DT got the nomination...just Opposition Research that goes on all the time by all political operatives. It took detailed FBI intelligence gathering to find such things as Paul Manafort sharing polling data with Russians to result in real indictments and convictions which shine a very bright light on the Trump campaign shenanigans...no matter how those 'misbehaviors' came to light...they point right at Trump and his campaign.
Due to the exceedingly high bar required to prove "Conspiracy" in the numerous Trump/Russia connections, and the unwillingness of key players to answer questions, or stop obstructing (note: at least ten instances highlighted by Mueller), Mueller was unable to bring charges...no help from Bill Barr's "guidelines",either ;-).
Link: https://www.washingtonpost.com/politics/2019/04/24/what-steele-dossier-said-vs-what-mueller-report-said/