The rest were just bureaucratic filler that most of the jury probably couldn’t care less about.

Which was itself part of the defense strategy. In similar cases, the two sides would agree on the validity of certain pieces of evidence, making those technical witnesses unnecessary. But Trump probably told his lawyers not to admit to anything, which probably drew the trial out for a week or two, and forced the prosecution to have to cover every detail, in the hopes the jury would find it all too overwhelming.