That is what I've ended up doing out of pure fear of causing a nuclear detonation on my street by trying to use Play and VEPro simultaneously.

I think if I simply had to use EWQL Symphonic Choirs I would not mix that lib. with an otherwise busy project but dedicate a whole level of the project to it. EWQL is enough of a PITA period for me to look for other ways to skin that particular cat. It is definitely something I would commit to audio and send that as audio input to MIR Pro; again here is a layer of a project.

But my [certainly lighter] use of a library in Play is, other than the seriously slower loading, not unlike using Kontakt in VE Pro. Using MIR Pro has naught to do with hosting it in VE Pro making sense per se.

I don't know what this means 'shares the memory of its VI'; but it seems to further show that you have a belief about Vienna Instruments as the proper use of VE Pro while other plugins are 'a non sense'. It is true that you can, through VE Pro learn and optimize the memory of Vienna Instruments but not third-party. To extend this to believing one ought not use third party instruments in it is a non-sequitur. The point of using instruments in VE Pro rather than in the DAW is they perform better, being in a different process. Look it up, ask around, something. 

You can do what you like but you are inflicting this misleading idea on the forum.

I don't see any advantage there per se, as you are almost certainly using more resources to do an audio input than you would to host it in VE Pro. Maybe there is something so botched with Logic's handling of cores? Who knows what's true for you and why, since what you are articulating conveys nothing of it, but this nonsense. Sending MIDI to VE Pro is that much of a load? Vs. sending audio? You're simply wrong. Everything you say seems to be illogical, based strictly in your strange beliefs.

For your information it is less cpu intensive to treat an audio flow than a midi  flow

 So you dont die i... : If in a same VE  you have Violon I and Violon II when you load Violon II you do not load the samples in memory, you just load the settings. Violon II will uses the same samples than Violin II, same for all the instruments, when you have 4 x French horns the samples will be loads once !

You see some times it is better to keep your mouth shut when you do not know fully the subjet you are talking about

another rule for VI, it is less CPU intensive to have then in a VE than in Logic because of VE. The Problem in Logic with VE is that all midi flow is treated on one CPU. So if you have other plug-ns they will be treated with another CPU