99% of people when asked to name a Fleetwood Mac song would probably pick one from Rumours. And if not Rumours then something from the eponymous Fleetwood Mac album (probably Rhiannon or Landslide or Say You Love me). How weird for people to think the Fleetwood Mac album wasn’t the first “Fleetwwod Mac” album. Why? Because they were basically a different band musically (and some members) with the same name.
Very few would pick “Oh Well, Pt. 1” as emblematic of Fleetwood Mac. Indeed, it is not emblematic of them at all (even if it is good).
ETA: This seems to be a sort of “Ship of Theseus” argument. When is the ship not the original ship?