Yeah, so much simpler,
"Common IHttpClientFactory usage issues"
https://learn.microsoft.com/en-us/dotnet/core/extensions/htt...
"Guidelines for using HttpClient"
https://learn.microsoft.com/en-us/dotnet/fundamentals/networ...
And this doesn't account for all gotchas as per .NET version, than only us old timers remember to cross check.
I didn't mention IHttpClientFactory - just HttpClient. I will concede that ASP manages to be confusing quite often. As for the latter, guidelines are not requirements anymore than "RTFM" is; You can use HttpClient without reading the guidelines and be just fine.