This discussion on which mistake the pilot may have made or what kind of technology could have prevented is pointless.
Shame on the city fathers of Frankfurt for not providing a suitable airport for executive jets. EDDF is congested and in the hands of airlines. Capacity for business jets is insufficient.
It shows how this city values industry leaders who bring business to Frankfurt and provide jobs. As long as the sheer size of an airplane is considered a benchmark on its importance any
low cost carrier can rival an executive jet (apart from a few). Egelsbach is below any standards for high performance jets during nighttime. Even in decent weather conditions during daytime it is challenging to fly a high performance jet under VFR in that cornered airspace with little leeway for error.
The way business travelers are treated tells a lot about the city. For too many years at EDDL there has been a shabby shack at one end of the airport where you could meet all top nobs while the main terminal for (mainly cheap tourist flights) has been a stylish noble building. You could see the same thing at EDDK and a number of other airports in Germany. At least Duesseldorf has a nearby general aviation alternative with EDLN and in the meantime there is a decent executive terminal (owned and operated by Jet Aviation).
This crash at Egelsbach may fall into the category of pilot error and thus be first and foremost the pilot’s responsibility. Failure to offer a suitable alternative to EDDF, however, is what we should focus on. In the meantime it should have become clear that Egelsbach does not qualify as an EDDF alternative.