This comment is so misleading it hurts my head.
Jack *is* the Linux answer to ASIO/Core Audio and it is more than capable of competing with these in terms of scalabality and low latency performance.
In fact a lot of high end stand-alone audio hardware now runs embedded Linux and Jack internally.
You do have some difficulty caused by Jack not being historically that easy to set up and get to run smoothly
It's design requires the loosening of some security restrictions in order to be able to operate at really low latencies,
distro makers tend to care more about security. It also shares problems with Windows (but not Mac) where some PC hardware
just isn't designed to deliver low latency performance and that support for audio interfaces is a bit hit and miss.
This has lead to a situation where a lot of people in the enthusiast community (the ones using the onboard realtek cards)
have just demanded that everything work with alsa because they want to spend time makeing music not fiddling with the system.
The good news is that in 2016 - Distro's generally add the security exceptions when you install jack and as long as your interface is well supported
and your other hardware is fit to purpose jack will work without too much effort (at least that is the way it seems to me - but I have experience).
It's comparible to getting a Windows/ASIO setup running but not as smooth as MacOS/CoreAudio.
Further good news is that VST support for Linux is a thing and is supported by the available DAWs.
This means that should a company want to port their plugins to Linux they just need to replace system calls (if any)