The primary issue is that the sound was designed to work a certain way with the old system, the system was replaced with a new system, but the sounds are still designed for the old one and therefore aren't balanced in the new method. They're working on the balance, they're working on the new system, and they're working on increasing some of the customization.
As an example : In the old system you had engine sounds at 45% but everything else at stock. Now, engine sounds are at the 90% they would have normally been by default (twice as loud), drowning out Flaps/Gear and other sounds. It has nothing to do with the sound file changing, nothing to do with the sound system itself changing, and everything to do with a new "sound level balance".
Honestly, the sound issues people are having for the most part have nothing to do with how expensive or cheap your computer components are.
In fact, the Miles sound system should actually work BETTER for people with lower end equipment than the old system did.