For you, perhaps. Personally, an f/4 UWA zoom is fine for my use cases. I had the EF 16-35/2.8 II, swapped it for the 16-35/4 IS since <1% of my shots with the former were wider than f/4. A fast (-er than f/2.8) UWA lens would be useful for astro, but for me a prime would be fine for that.Canon RF 16-28mm f/2 is much better zoom lens to have.
OTOH, for me a 70-150/2 would be a great lens. That would give me the choice of covering 24-300/2.8 or 28-150/2 with two lenses.
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