If you use a decent log viewer - then you can simply filter it out - on live logs if you wish.
I use Advanced Log Viewer - Free on Github.
Then just create an Emby template/parser - Emby uses standard Date, Type, Class, Message - so all very easy. You can then filter on anything you like, Classes, Error only etc etc. To get rid of any web notices - simple negate http .. they all disappear from the list.
All new messages are auto scrolled so you can watch things live once you have setup a filter ...
Reading ANY log as is (not just Emby) simply cannot be effectively done without these tools .. personally, I think they should be integrated into emby (the basics anyway).
But having said all of that - the option to remove 'playback' entries at source is a good idea, especially on a busy server.