Oh come on!
The Xperia 10 II is at least on par with, if not better than previous ports.
That ports exist in a complete vacuum from each other and therefore only compete for effort is also not true. All Xperias are consistently getting updates to the adaptation too - the older, the lower activity, but none the less it does not stop.
And that one (public, Sailfish X) port every 18 months (less this time around it seems) would be just so much that they couldn’t possibly cope is such a weak argument. As can be clearly seen the porting efforts aren’t 100% directed at one phone and then hard-switched to another. There are common parts, framework efforts, times with lower intensity, presumably work for other customers etc etc.