Here we are in the digital age
 - and now it is harder than ever to control volume levels.
Why?
Years and yeas ago people listened to AM radio and all radio had AVC, automatic volume control. It worked.

Now our TV sets blare at use with the commercial comes on.
I watch Netflix on my PC and I can not get enough volume even with earphones on!

Yeah, I am old and my hearing is GOING down. But I am sure the volume level is going up and down and out of control.

A Google search shows that many others complain about this and NOBODY has a real answer. Is there some kind of conspiracy to confuse our senses? 

This does not work:
https://windowsreport.com/pc-sound-volume-too-low/

Amy body?   I feel your pain. My wife, a BLUNT Northerner from Lancashire, calls me "deaf-lugs" when I want to increase the volume. Good TV's have level adjusted volume...i'm glad i payed for it...however to your point it should;nt be allowed...and the FCC is to blame. At least here in the States.As Patio said most TVs (He said good but I can't bring myself to call my Vizio "good"- Acceptable, maybe...) have something like Volume Normalization. I don't know about commercials (As I don't use netflix or Cable or anything that would have them on the TV) but with some TV Series Blu Rays I found there was some questionable leveling (quiet DIALOG, loud intros/music segue's, etc), stumbled upon the setting and that sorted it out for me.

PC's themselves will usually have some form of volume normalization or AVLS type feature in the audio properties.