Hi,
From RDS deployment perspective, users are allowed to scale out the RD session host servers by add new RDSH into "collection" and it will provide you customization properties via GUI.
This provides higher collection availability and increases scale to support more users or resource-heavy applications.
Reference links:
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-roles#remote-desktop-session-host
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-scale-rdsh-farm
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Hope this helps and please help to accept as Answer if the response is useful.
Thanks,
Jenny