I concur that it should be in the stock mod install, at least with a checkbox, along with Sombra's music pack. It's not like its going to hugely increase the system requirements.
Indeed. I have a most decidedly "potatoish" laptop with (ugh) integrated graphics, and the only time I experience fps drops are when there are a large number of players nearby. This pack adds so much, yet as you stated, doesn't require a beast of a GPU to run. It's time to give Disco an upgrade!