>You own 90–100% of it, take the lead, and avoid butting heads and blame games as co-founders. You’re now accountable and responsible since it was your idea, your vision, and your commitment, but you enjoy full autonomy–a gift unlike any other in real life, TBH.
This has always been a fairly good starting point to negotiate from.
For a "non-technical" business, the technical business partner is about like a hired mechanic who picks up the loose ends when they appear, in a business that is not primarily technology-based. Kind of like with used car sales.
If it's going to be a technology business of course it's the other way around, the technology is best owned and operated by a technical leader who has way more skill at running a technology business than the most advanced MBA, and from there carefully chooses a non-technical partner who can pick up the loose everyday business ends for not much equity or decision-making responsibility.
Getting this backwards looks like an even more prominent cause of complete failure than many other things.