My friend, I've never given bass neck radiuses a second thought...
In my experience, many lifelong 6-string guitarists don't really care about radius either, despite radius being a more impactful dimension on that instrument.
... and for bass, for me, radius isn't a primary concern either. I've never played a 5 string in my life, I don't know what I don't know yet. Maybe I'll want something super-flat on a 5 string, maybe I won't care... maybe I'll hate 5 string altogether and just get a second 4-string tuned to B-E-A-D.
... but IF I'm ordering a completely custom bass neck, where I choose every dimension... I kinda feel like I should have the option to do a compound radius... I would want to order something with a spec you couldn't find on The Stratosphere's eBay shop, you know?
- Make it sit in the track or your mix will sound whack. String gauge, wrap type, cotton or foam under the saddles and pick type or fingers and the technique used are the best EQ and dynamics processing.
Given that I'm still learning the instrument, I limit myself to 1970s session bassist rules:
Show up with a 4 string P or J, strung with flats.
Whether you record direct into the board, or through a mic'd B15 is the Engineering Team's decision, not yours.
Your fingers, your strings, and your tone knob are your signal chain.
If the song needs something brighter, use your fingernails, a pick, switch to rounds, or put on a fresher set of La Bella flats that are still in their big-bright-angry-acoustic-guitar-sounding phase.
Any compression applied while tracking is the Engineer's decision, not yours.
You probably weren't the first bassist they called, so be humble and do something simple that flatters the song and the other performers.
I want to learn to play through a new/unfamiliar chord chart in a competent and tasteful manner -- obsessing over bass pedals, plugins, and amps will have to be someone else's problem. Ditto for exploring bass as a lead or solo instrument, that's someone else's journey, not mine.
The idea of a compound radius on bass is interesting though. I mean, why doesn't warmoth offer that? Seems like bassism. Which is a portmanteau of racism and bassist...
Ha! I almost accused them of bassism too, using that exact portmanteau... great minds!
Fender's Mononeon signature bass is a 5 string with a compound radius (10-14", I think?)... Fender wouldn't have gone to the trouble of tooling-up the Mexico assembly line to do a compound 5-string neck like that if the artist didn't feel strongly about it. They don't offer that neck on any other products, so it must have cost them some $$$$ to accommodate... so yeah, I'm curious to at least try one.
So about fancy bass brands, my buddy has a fully customed out Warwick Bass II, gibson EB-2 style, that is hands down the best playing shortscale ive played and it produces the roundest, fullest tone I've ever heard from a hollow bass. It's a spectacular bass. Every Warwick I've picked up has been better than average but when you gave something fully customed out like my friend did, they really step up their game. They fulfilled every requirement he had and accommodated all his fiddly requests. If they offer the small frets on a compound radius, Warwick will treat you right on a custom instrument.
I'm glad to hear that. I'm curious about both Warwick and Spector basses. Never played either, but both those brands came on so strong in the early-mid 80s with basses that were clearly attempting to move beyond the Fender paradigms... It had to be more than just pro players following a fashion trend, you wouldn't have seen the mass adoption that happened if those brands weren't offering something special.