This is a double-edged sword for us. The reason this is much easier for them is because they capture the end user as a user of Plex - not a user of your system. We would like to get better multi-server features but, when you are in complete control of your server and users instead of us, it becomes a much harder thing to do.
The primary reason they are designed this way is because the moves they are making now were in their plans all along. They had to be because the real money to be made is by capturing the user and being able to present content to them from any number of sources. We have not taken (and do not plan to take) that approach. Plex, I'm sure, has always planned to because that would really be the only path to the returns their original investors will require.
Unfortunately this doesn't matter to the majority of their users or media users in general. When they had the ignorant idea to stop allowing you to opt out of usage stats the backlash was huge, amongst a small group compared to actual user numbers. What most people see is uniformity and as much as they can get in one central area. Thats all that matters to them.
Emby could absolutely be the top dog for personal media consumption but some things need to be addressed and changed for it to do so. At this time though, when you break down the pros and cons of each, the 2 softwares have too many pros and cons to recommend one over the other. It still boils down to which one has the features you want that work the most.
You need a substantially easier method to secure the server and what's being streamed. Getting HTTPS to work is a freaking nightmare for users who don't understand it. With Plex its available at the click of a button.
You need to be able to specify libraries for each recording if you dont want certain things showing for other users.
There is still, after years of hearing "its coming", no conflict resolution for recordings. That to me is insane for a DVR to be missing that.
Live TV tuning is still the slowest out of any software available.
Auto bitrate adjustment during playback is desperately needed.
Those few things would absolutely make Emby the go to personal media software. These are all things that have been requested for a LONG time now. Instead things like moving button locations and should we group trailers and extras took precedent.
And lastly, limiting users to 15 devices while preaching that you want to allow server admins complete control of their server is a bit backwards. No other software I have used has this limitation as far as I know and it turns away a substantial number of new users. I personally have never had a problem with the limit but I have watched countless people see that and walk away from Emby. Just doesn't make any sense to limit someones personal server if you want them to be in complete control.