This was decided in BoF at GUADEC 2019. See https://wiki.gnome.org/GUADEC/2019/Hackingdays/FreedesktopSdk/Notes
We will still support armv7 until 2021 with 19.08 branch.
Rationale for the removal
- Servers to maintain the armv7 builds are not free
- Usage of armv7 build is very low according to flathub's download statistic.
- Most desktop arm distributions have moved to aarch64. The exception being raspbian, but they do have betas for aarch64. So 32 bits is effectively phasing out.
- There is no big history of binaries distributed like we had with intel, and armv7 compatibility is not available on all aarch64.