Yeah I can totally understand you but Jolla has no other option, at least for the Sony Devices then to work with what Sony gives them in terms of software Blobs for the Hardware.
The slow adoption mostly has to be put on Sony for providing non really good functional Blobs of Software.
Also Jolla can only start adopting after the Xperia Devices are added to the ASOP Programm and that also takes some time until that happens so yeah.
But still very frustrating.