Designing a lens has tradeoffs. To satisfy a tiny minority who prioritizes extender compatibility on a certain lens will presumably make the lens less attractive in way that are more important to far more potential customers. It's not a "fiasco" - it's presumably a smart choice. I switched to Canon for great lens designs like the 70-200 2.8 and the 100-500, whose benefit is to get to 500 without an extender.
Tamron and Sigma don't seem to have any problem getting a zoom to 600mm without an extender. And f/6.3 too...
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