in a modern plane, you do not fly dme arcs... not mentioning the ndb approaches, or the VOR's.. all FMS derived...Some surprises, yes of course , in countries not WGS 84 compliant...but then it is natural selection..
RNP SAAR is ruling nowadays, and because of the savings induced, and the independence of ground infrastructures it suits a lot of people. But without 2 IRS on board as a continuous backup, i do not feel confident on shooting a stand alone GNSS approach to minimas anywhere on the planet, and especially in urban area, due to very hazardous threat of GPS jamming signals.
But this is me only..You have to do what you have to do..