All SEOs say you should redirect old pages with links to at least new single page.
Best is to redirect page-to-page.
Redirecting all old pages to a new homepage as said before will be soft 404, and it looks 100% unnatural.
You might buy an expired domain with excellent metrics and a clean profile. But still, you can't say that the domain is fresh and has no toxic element till you test it. So I always test the domain before adding it to my network or redirecting to my money site.