My spouse is 58 and their 401k has a substantial balance.
I has a solo 401k for my retirement savings.
I have the option of creating a 401k account for them under my company's solo 401k plan.
If they were to change jobs, assuming they are likely to work for the new employer for \~7 years, is there a compelling reason to not create the account and roll their existing 401k into my company's plan, and then let the savings for the new employer accrue separately?
I've taken a Boglehead approach to both of our accounts, simply relying on index ETF's and SGOV.