Curious, for more conventional genres of sans serif (grotesques, geometrics, etc.), I've wondered about the different approaches that may be taken for a display version. This is more in the context of designing a sans face that is more "text" oriented, but then has a display counterpart. Typical considerations are at play with spacing tightness, contrast, apertures, x-height, etc.
Approach and resulting design seems generally a little more clear when distinguishing text vs display in serif faces, but maybe less consistent or distinct (?) in a sans (depending on design and intent, and without the resulting design becoming a high-contrast sans that feels too unrelated.)
It's a bit muddy to me and don't think I've seen enough examples, but those I have seen that included both are Helvetica Now and Neue Haas Grotesk. Wondering about others that are liked out there.