mine is more minimal for dependiencies, uses a fixed qt version ( which can be worse, using a maintained version is always better ) but i haven't seen any diffrences in qt / problems which are fixed in kde qt. If creating the bare toolchain won't break, everything else will work too.
Also, to avoid compability problems ( there are problems if 2 identical toolchains, compiled on diffrent machines try to work together... ) we just ship the binaries for inkbox apps, which can be used anywhere else too
https://github.com/Kobo-InkBox/compiled-binaries
The description is wrong, it is maintained but i can't change the description - thanks nicolas