Into the vortex of the interwebz... I teach and coach. I spend a decent amount of time skiing backwards watching people ski. Twin tips aren't necessary at all ( I teach on everything from SL skis to 118 Powder boards, but more often on a cheater GS or all mountain 88) unless you're sliding around in powder, or thicker, deeper chopped up crud switch.
In a group teaching situation, I use kickturns regularly to face a group or individual in the group when we're out of alignment at a stopping/starting point. I've done them for over 50 years so they're second nature. I do teach them to kids when we have a moment while waiting to meet another group or parents. We even do kickturn races once they get it dialed. It's fun and useful. I also teach all mountain skiers to get comfortable moving backward in steep terrain to access a line or entry... think 'falling leaf' entry.
Kickturns, moving backwards, and skiing switch all have their tactical time and place. Many skiers of late don't do kickturns because they can't and end up in wild twist ups trying to talk to or help their kids, then sliding to turn and then having to side step up. It's tiring and a waste of time when a quick kickturn gets you where you need ro be in an instant. I teach new instructors to do them as mobility and quick direction changes in tight spaces (to repeat) save both time and energy.... and hopefully that's all I have to say about that.