Something that's always confused me, but I think I have it square now, is that - in its final incarnation at least - Crossrail == Elizabeth line right? The former is mostly just a legacy codename from before the Elizabeth name was announced?

It's occasionally made me mix up Crossrail & HS2, because 'the London one' is 'the x line', obviously.

Or perhaps it's marketed/signed as 'Crossrail' far enough outside London that there aren't any other lines, and nobody there would really consider it an un underground line for their purposes?

Bond Street's odd at the moment, after months of closure to make the Northern line wheelchair accessible, there aren't any lifts that I can see. But perhaps it's just not finished - access to the Southbound platform is awkwardly via the North, and there's hoardings around (ongoing work on) the connection from there to the Central line.