Thre are more solutions abaout Thin Clients than LTSP
I try
it is a nice x11 version 4 Termnal Services
but now the problem ist real thin Clients are out 
Thera are some PI solution 4 as a thinclient
Why the reaison are the Web-Browser all big browsers usese the grafic HW direct for rendering thats sad.
I will try a Mid Client, Browser, MailClienst and are local other “Services” runnig serverbased. Like Nextcloud and OnlyOffice…
Booting first stepps are like Thinclients (if you like with smardcard). Is the software on the Mid-Clint uptodate the “local” boot drive will be uses (64-128G is mutch 2 big). When local Storage is not upto date or corupted the Client take a new Client-Image.
Some “Thinclients” had a good performance to run as a Mid-client