Hi Justin,
it's great to see you having a very good experience!
Thank you for your feedback regarding 0 A.D. on gaming platforms. The idea of adding our beloved game to platforms like Steam, GoG, Microsoft Store etc. has been discussed many times. Most results of the discussions consisted of "Won't do it". If you are interested in the arguments, check our search function for the forums (results for 'steam').
Best wishes, obelix