In most cases yes. In the Pa case that made it to the SCOTUS both sides were given time to present their briefs to SCOTUS. In the Texas case before SCOTUS the same occurred, in fact many other parties from both sides were allowed to present them as well.
Then in Wi, the Trump legal team was given the opportunity to present all their evidence and for some inexplicable reason they declined. You can read about it here...
https://www.nationalreview.com/2020...rom-the-latest-court-rejection-of-team-trump/
Then there was the case of Trump campaign et al v. Kathy Boockvar et al. In this case the judge heard opening arguments Nov. 17 in a Philadelphia federal court. What the Trump team asked for was denied and then the denial was upheld by the appellate court.
Then there is the case of Trump campaign v. Michigan Secretary of State Jocelyn Benson. This was denied due to "the lack of evidence and detail provided by the campaign.". So, once again they were given the chance and they failed to provide any real evidence.
Then in Az there was Aguilera v. Fontes, which the Trump legal team joined and when the judge instructed the two sides to find a path going forward, the Trump team withdrew their lawsuit instead of working with the other side and the judge.
I could go on and on and on and on and on....but really what is the poing