I can respect some of the sentiment. But for the most part this is little more than old guys moaning about things they ignorant about.
By and large, things are FAR more reliable than days past. Service intervals are far greater, and things simply last longer.
They are however, not typically serviceable. Which is why I can understand SOME of the sentiment.
I too like things to be serviceable. But if they rarely, or never fail... whats the problem??
A simple example is the fuel filter on my 6.2 Ford.
What filter? Yeah, thats right... there is no serviceable filter. Its built into the in-tank pump.
So the filter change isnt even on the table anymore. Zero maintenance needed.
And the pumps essentially last forever, so what are we even talking about?
Id say you are fortunate to have locking hubs to begin with. Ford is the single hold out for front locking hubs (fullsize)
And the vacuum hub problem isn't anything new. It relys upon vacuum (duh) and its weak point is the inner hub seal.
No seal lasts forever. So either replace the hub seal or toss selectables on it if you don't already have them.
I have more of an issue with the unit bearings myself. Many are getting less than 75k out of a set.
And when they go... they GO. So I have converted over to a Dynatrac setup, that uses traditional taper bearings and manual lockouts.
But you do have to get your nancy butt out of the truck to lock them. Sorry