That would be a good thing. If the /e/ OS ROM without microG has implemented Signature Spoofing by default, so it is “microg ready”, microG can be easily installed with NanoDroid-microG. Users, who don’t need any location services at all, can also do without microG services.
/e/ »will be introducing a ROM later this year with the bare minimum apps 2 giving users the choice of installing what they prefer. Personally I am also looking forward to that version of /e/«. Me too.