I think the focus is now on performance (in terms of weight, stiffness, damping on suspension etc) rather than durability or easy of servicing.
So in that sense modern bottom brackets or suspension forks are better, but the downside is modern bits don’t seem to last very long.
Old marzocchis for instance were great for servicing at home. You could do everything, even change an individual stanchion or the bushings. V-brakes were rubbish but very easy to maintain (no stuck or damaged pistons that are difficult to remove). 8 speed stuff was a lot more resistant to poor cables, and square taper BB’s whilst flexy, lasted for ages.
This is why i use an98 year old bike with 8 speed shimano sora and square taper BB for commuting, but my mountain bike has all the latest kit.