[Brightcolours]

The thing is - what's the point of going FF then? The prospect that you MIGHT buy something faster in some years?
It's not even a small lens.

The point is not that hard to see? Inexpensive standard zoom with a big range. One would COMBINE that (whoa, what a concept ;-) ) with other (prime) lenses perhaps, instead of "prospecting" on replacing it with something faster later on. Like with a fast 50mm f1.2, or a versatile 35mm f1.8 macro, or a portrait lens? Or even that 70-200mm f2.8. Or other lenses one might already have.

I shoot FF, with a 70-200mm f4, 55mm f1.2, 35mm f2, very occasionally 140mm f1.8, 85mm f1.8, 135mm f2.8, 90mm f2.8. And what is my current "standard zoom"? A 35-70mm f3.5-4.5. Yes, you could argue what the point is of FF if one would only have that standard zoom, indeed. But in reality... a bit silly to wonder what the point is since the only thing that would be silly is to get a camera designed to have exchangeable lenses, and only get one lens for it.

It is "not even small" you say. Yeah, it is bigger than a EF 40mm f2.8 STM, indeed.
In reality: it is said to be 76.6mm wide, a huge whopping 1.3cm wider than that Olympus 12-45mm f4 you seem to think is small, and 18.8mm longer than that Oly "Pro". And while it has a bit- to much larger aperture over the entire range, it only weighs 395grams according to the rumour, 141 grams (!!!) more than that Oly.

Back to reality... It is (rumoured to be) a compact and light lens. It is not much bigger than that silly small 35-70mm f3.5-4.5 lens that I have.