Excellent -- Meson is so much clearer than the alternatives. It has the advantages of Bazel and similar (Pants, Buck), but seems more geared toward smaller projects, which is great for those of us not using a mono-repo.
That's unexpectedly. Meson is not so popular build system (and appeared not so long ago), but looks interesting. Autotools is pure horror, Cmake uses almost the same approach as Autotools, Blaze derivatives Bazel and Buck are only suitable for specific uses, Gyp is little known outside Chromium and was created for it. So maybe Meson is sound choice.
For some reason Meson seems to be quite the fad in the Freedesktop sphere.
Systemd is adopting it, Xorg as well apparently, and now GTK.
Only issue i foresee is that now i need a working Python3 to get things bootstrapped...
We started using Meson on one of my projects and it's rather nice imo. I wouldn't use it for every class of project but it's well suited to something like GTK+.