MQA may be partly to blame but my guess is the more likely reason is that these items are slow sellers and about to be discontinued in the interests of simplifying the product range and cash flow.

Streaming: Roon, NUC, QNAP869 NAS
2ch system: dCS Vivaldi, Audionet Stern, Audionet Heisenberg, Magico Q1
Retro system: 101/104/105, Red Rose Spirit