These are exactly the things that concern me.
Lets say what you say is the reason, it doesnt seem like a coordinated well planned effort.
Going to the official XPERIA Youtube channel PS Now and Playstation barely give any results and the most relevant results are 4 year ago.
https://www.youtube.com/user/SonyXperia/search?query=PLAYSTATION
They aren't highlighting PS Now or PS4 Streaming on XPERIA. Everyone can understand the ability to stream their PS4, but it needs to be highlighted as a unique feature on XPERIA phones to someone who already owns a PS4 in order to buy one.
They are basically limiting PS4's Switch-like functionality and the expansion of a service that can bring revenue without compensating for it.
These may be marketing tactics that do more harm than good. If it's those strategies the cause of Sony's silence or lack of effort then it is reason for concern.