I sincerely doubt it, but a large OEM with first-party support makes it (IMO) more likely for banking apps to support GApps-less handsets(instead of the inverse, Graphene supporting banking apps) - a dramatically better outcome, as that allows Waydroid more breathing room as a viable solution for Linux-first handsets too.

This would of course be contigent on GrapheneOS growing their market- and mind-share in the general public, while also taking several years to impact the least move-fast-and-break-things industry (consumer banking).

But still, a man can dream.