this is completely wrong. internal audio interfaces tend to be worse than external audio interfaces. what internal soundcard can compete with a universal audio apollo?
Audio engineer here. It isn't wrong. PCI and PCIe cards with external AD/DA converters have better performance, reliability and higher channel counts. Eg.:
64 channels in, 64 out. Works fine on Linux.
I used Ardour for ~8 years, then switched to Non DAW ~6 years ago: http://non.tuxfamily.org/
USB devices _do_ incur extra latency. The USB apollos do suffer from this. The firewire and thunderbolt do not.
Whether a devices is internal or external is irrelevant. There are "Internal" devices that are PCI based which have excellent performance, and external devices that are Thunderbolt based with equal (and better!) performance characteristics.
I believe you're talking about onboard sound, not "internal", in which case you're correct. However, that's not what the link is talking about.
It wont also have proper Line and Instrument just a 3.5 jack if your lucky and a combo jack in a lot of cases