Device support /e/OS vs LineageOS

Since /e/OS is based on LineageOS, I am assuming the lower level OS functions (like hardware interfaces and device drivers) are carried over directly from LieangeOS, with heavy customisation mainly at the interface/launcher/default apps layer.

If that was true, I would expect the list of supported devices to be (nearly) identical between LineageOS and /e/OS, but the differences are significant.

Can somebody with a better understanding of what’s actually under the hood in /e/OS, help me understand the reason for this great difference in supported hardware?

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I’d wait for A15 releases, then do a comparison by count. Numbers aren’t not much off by a superficial glance within the same target version.