The universality of it comes with a cost - the install has to be accessible to everyone, but that is NOT the case. Some people should not install and should hire a professional. AND FFS! - ** cut out the baseboard for flush install ** - always request that. Any installer should do it.
I disagree with IKEA that the PAX should last 10 years. I think it can easily last 20 years - you just have to follow my instructions. Simple modifications and additions dramatically extend the life. No, the hardware is not going to fail - it will be the box! That is why drawers stick and rub, and doors rub and sag. It is crazy stupid that an addition of $5 tube of silicone will alter the PAX for its life.
For all the totally custom solutions that I can design and build, there really is no reason to do any of it because of PAX. My very reasonable and pragmatic asks, 'why should I make myself life difficult, when I make it easy and modular?'