Some of the hand and kick techniques are not possible to use when you got some guy in front of you who is tense and ready to chuck a punch or grap you in the front.

The main thing is, each technique, esp. hand, is telegraphed, just practise the,
knife hands and you will see what I mean. Strange why did they create such
an interesting and part useful and part useless art (re: karate & TKD?)