I suppose some of the problems in flying a raw data approach when much/all of your day-to-day operation involves radar vectors to an ILS or some kind of PBN approach, are not that you can’t do it or don’t know how, it’s the difference in preparation, execution, familiarity and workload.
RNAV: Load approach into FMC(s), check, brief, set up MCP, altimetry, FMAs, RNP/ANP, progressive config, etc. Much button pressing and checking of automation which has deviation alerts but 99.9% of the time does it all pretty well.
Raw data: Brief, tune/ident navaid, procedural, timing, tracking, altitudes, full config, descent rates, more tracking, etc. Hands-on with the aeroplane - no alerts or warnings that you’re not doing it right until the EGPWS gets involved.
At first glance, they did bits out of both lists but omitted some of the more important items.