I suspect so Keith, more stable components, tighter tolerances, better manufacturing techniques & of course they all have a lot more knowledge regarding what works & what's to be avoided.
Take coil construction as an example, disregarding very early wooden coils, they went foam to hollow then epoxy, back to foam & most have now settled on epoxy being the most stable long term with correct flexibility to withstand a fair bit of abuse, hollow can leak (& will) foam is great until it gets any flexing or knocks that collapse the closed cell foam, leaving behind a void that has no structural integrity & is now hollow, see above.