I was open to this, but someone mentioned this effectively lowers the scale length (since you're moving the "nut"). Normally not an issue except tuning down 2 whole steps on the 4th string. Unless I'm thinking about this wrong.
That is a misleading statement. Using a capo doesn't change the scale length of the instrument, or the tension of the strings, or the location of the notes on the fretboard.
Putting a capo at the 1st fret is the same as fretting the 1st fret, except you are using a capo instead of your finger.
If your bass sounds good when you play fretted C at the 1st fret with your finger, it will also sound good if you play "open" C with a capo at the 1st fret. A capo is just an artificial finger. There is no audible difference (on a fretted bass; maybe fretless you could hear the difference).
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