Ethernet vs. Wi-Fi Traffic Prioritization

Context:
In my home office configurations, I have everything hard wired for lab work (VMware vSphere/vCenter 5.5 hosts with multiple VMs for various configs) since wireless networking is often not as reliable for high volume traffic.  Specific to my iMac, I have multiple scenarios running and am communicating via VoIP/Skype/Messaging apps.
Background:
I have already prioritized traffic on my iMac to ensure Ethernet is always first.
I've also wiped network settings completely and rebuilt (reference: http://osxdaily.com/2014/10/25/fix-wi-fi-problems-os-x-yosemite/)
To be fair, this is also not specific to Yosemite as it happened in Snow Leopard, Lion, Mountain Lion, and Mavericks.
Issue:
What I have issues with is when I have Wi-Fi enabled, I often see some high volume network traffic (even things like Skype Video Calls) degraded as the system has decided to use Wi-Fi vs. Ethernet even with the above prioritization.
My Questions:
With Yosemite, do I gain anything by having Wi-Fi enabled?  I have not found any gains so far but I don't know what I don't know.  Does Yosemite do a "pseudo" load balancing of network traffic or some other optimizations?
Do I lose anything of significance by not having Wi-Fi enabled and connected?  I have found I cannot use things like AirDrop when Wi-Fi is disabled but I don't know what else is tied to Wi-Fi.  I know continuity still works though.
What causes Yosemite to select Wi-Fi (the secondary Network connection) when it is designated as lower priority?

Continuity (The ability to make and receive iPhone calls on your Mac)
Actually, it's just called, "Phone," it's one of the "Continuity" features.
See here for all of the "Continuity," features: http://www.apple.com/osx/continuity/

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