I would not expect a tape pass through to be entirely neutral. Tape will add gentle compression and extremely low level dither to the audio thereby gently compressing dynamic range. This process adds warmth and lifts detail slightly. Those are characteristics that lead a lot of musicians to run their mixes through a tape machine and/or purchase software that emulates several famous tape paths.
Exactly... mastering engineers do this all the time. It's called "tape layback". A lot of studios are also mixing down their multi-tracks to tape. This is nothing new and has been going on for decades.
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