I understand that maybe this will not help everyone but there could be certain clients who would like this option. Ideally SolarWinds GUI will work fine for upto 50 concurrent users (not sure how many concurrent users does 2020.2.4/5 support) but then there are several others reasons like hammering views on your home page or custom resources or lot of other things that are being done simultaneously by these users.
If you could add in an option called 'Concurrent User Limit = X' which can be managed by a SolarWinds Admin that would be great, you can use this option to restrict concurrent user login and access and as well during maintenance period like upgrade we can set this to 1 -> 'Concurrent User Limit =1' this will restrict other users to login while we are still validating our upgrade during maintenance period.
Another reason that I can think of, say suppose our Additional Web Server and Primary Poller UI both are up and running we can use 'Concurrent User Limit' on both which will restrict users to access only one particular URL at any given point in time.
https://documentation.solarwinds.com/en/Success_Center/orionplatform/Content/core-optimization-website.htm