It’s no special change in 19.1. Installing in the doc-root was never recommend.
The proxying we do now into the diverse containers, makes it even harder to install in the document-root. Just to give an example: EGroupware’s rocketchat app would use /rocketchat, so does the Rocket.Chat container.
Of cause you can change now the Rocket.Chat container to use some other URL …
I can only say, there is zero benefit from installing in the document root, but a lot of trouble!
(You should redirect / to /egroupware/ anyway, as our proxy config for the RPM/DEB packages do.)