Citrix imploded? That’s news to me. It’s pretty much an industry standard in US healthcare.
(PS: I'm joking, I hope the product has become stellar. It very much was not back in the day when I had 200 users on it).
My experience in the early 2000's supporting enterprises with network attached storage was they started moving away from Citrix to the VM/VNC solutions often from VMWare. At the same time Citrix started buying a bunch of different companies to expand into other markets.
That people still have to use it is a testament to this architecture pattern's resiliency in face of systemic challenges :-)