If depends on the instrument, and the style of music.
Often “continuous legato” sounds completely unnatural, and is a dead giveaway for “computer rendered music.”
AFAIK NotePerformer is actually a bit smarter than just playing the 85% lengths that Dorico sends to it. It uses the 85% figure as a “marker” that the notes don’t have any special articulation marked in the score and then chooses the gaps between the notes according to the instrument and the tempo. NP “looks ahead” at the playback information from Dorico for 1 second before playing anything, so it knows “what comes next” before it decides how to play each note.
If you set the Dorico playback to 101%, effectively you are telling NotePerformer that everything is marked “legato”. If that’s what you want, there’s nothing wrong with that, but for some real instruments (e.g. low brass) playing that way is physically impossible for humans.