MS lobby puts a spoke in these wheels, govt contracts are a lot of $$$.
These distros are ofc developed by lazy PSUs like our CDAC here.
The Chinese have switched to using Qilin Linux which is an Ubuntu derivative, made by Canonical( that also make Ubuntu) and Windows, because they have a deal with MS with which they can inspect the source code of Windows, only country other than the US to have such an arrangement with MS.
Afaik all the IT hardware in US gov networks needs to be manufactured in America, so Huawei is more of a civilian networks issue i think.
Anyway the fact that Chongs manage to ez hack our govt is more on the incompetence and carelessness of the concerned groups like NIC rather than something specific like an OS or networking hardware.
Remember, the hack happened at NIC because someone clicked a link on an e-mail lmao
NIC like every Defense or IT PSU out there needs the stick.
en.wikipedia.org
Wiki says they do have vowels but it's like the "matras" in Devanagri script, with no independent forms like अ इ उ etc.