The only reverse P I’ve any experience of was hearing a Mark Hoppus Sig bass, to me it evened out the sound very nicely, as above lost low end flub on the E/A, and also beefed up the D/G.
Interestingly this was at a blind P-Bass shootout at the Herts Bass Bash some years back. Up against some heavyweight opposition (50s, 60s, 70s Precisions) the Hoppus was the runaway winner, bassists voting with their ears only.