For sure, it's not really meant to bring at jam sessions. It's a transcription of what's going on harmonically. It's not a piano part. The harmony is mainly played by the strings. The interesting part is how those chords are intrincate with the melody. It can definitely be simplified for live performance. However, I've played that songs many times with different pianists using simplified charts. It works "ok", but I always felt something was missing or not right in the harmony so this is why I've transcribed the original version.
As for the iReal pro player, I've set it up with the style jazz long notes, so it could be played with strings sound only (with less attack than a piano) so it won't sound too "heavy" when playing those chords on each beats. You can try to change the instruments in the mixer. It can also work with the jazz ballad even style. The problem with iReal pro when playing chords on each beats, is that the bass also repeat the notes even if the root is the same for the entire bar. Live musicians would never do that. Also, strings can hold chords while only moving a single note. iReal pro always repeats the full chord even if only one note in the chord is changing