Have to disagree with the notion that Directionals are outdated. The pros apply this concept regularly. Particularly at the club level, cross court should be the rule and DTL the exception.
Have been on this topic a couple of years ago.
My personal opinion, Directionals are good starting points.Not the end all.
Sorry Pro's dont do Directionals. Pro's do a lot of things and people use them to substantiate whatever they feel appropriate.
Nadal almost always goes to Federer's backhand. He doesnt need any directionals
Fernando Gonzo always tries to hit a forehand. He has bigger things to worry than some basic directionals.
I guess Sampras didnt get the memo. he tries to S&V.
Several factors such as one's strength, current form, opponents weakness, strengths, court speed,condition, opponents position, one's own position, general strategy, score line of the match, one's mental/physical fitness, etc come into play during shot making, not just "lets keep cross court until one of us hit DTL".
It is my experience that most old timers seem to disuade opinions against directionals. All the power to them if that floats their boat. As long as i dont get that crap, i am good.