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I have one customer (global company) using many RPi3 managed by Stratodesk. Works great for them. However, I see customers not going to Linux devices due to the different Citrix Codecs that don't work well on them (YUV444 or BuildToLossless).

IMO, in Linux YUV 420 is fine for most purposes. Video up to 1080p full frame runs great at up to 30 fps and everything else looks and behaves just like a standard desktop with a Pi 4B and even the 3B and 3B+ were already pretty good. We were going to do somewhere between 200 - 300 RPis with XenDesktop but then without warning, the project got canned and the powers that be decided on thick clients (PCs). I will probably never know why that decision was made. I spent the last 4 to 5 years working on helping to make the Pi a viable thin client for Citrix, then this happened. It hit hard and I'm still not over it.