I have a Xperia 10 iii in use, and did it exactly as described : flashed Sailfish immediately on it without trying Android on this device.
There are bugs, my device us affected by the ‘no audio’ after GPS use bug, as reported here: No audio after some time, have to reboot - #76 by MeeGo-Junky.
There is the suspicion by some very knowledgeable people on this forum that the underlying Android version before flashing might affect the bugs within Sailfish, therefore, as you said, that in sense some bugs with Sailfish on Sony devices might indeed be rooted by Sony in a way.
Let alone for this reason I am looking forward to test Sailfish on Xperia 10 V, to use it as comparative device
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