I agree with this thread.
Simplicity is often the best approach. But, then again, it's always nice to take Fox that extra mile and do some cool trixies. As far as my playing goes, I can't really help it. I just do whatever comes to me, which usually involves tons of technical bull****.
The shine grab is nice if you're trying to catch your opponent off guard, but so is jump cancelling your shine and landing behind the opponent's shield with a bair or nair, which I'd actually consider much more effective when it comes to getting out of the "attack zone", so to speak. You can just turn around and run away, if needed.
This also ties in with simplicity. Technical skill is never actually reliable, no matter how good you are. You can still be grabbed out of a doubleshine against a shield, and there's always the chance that you may screw up and put yourself into a sticky situation. A lot of players think too much when they play, saying things like, "Well, if I do this, I can then do THIS", which results in a strong focus on the said mindset. If that focus is broken, say, by a grab, you can be totally caught off guard, and forced to once again re-think your strategy, something that will slow you down and possibly give the opponent the upper-hand.
Going back to the effectiveness of simplicity, a prime example is varying the height of your doubleshines so that the second hits right above the head or the top of the shield. This prevents being grabbed, and allows you to jump out of that shine with an aerial. On platforms, I like to shine -> shine -> jump onto a platform -> wavedash off or fall through with an aerial. It sounds like a lot, but it's tons better than risking being chaingrabbed when you screw up your grounded doubleshines. Not only that, but it's great for catching your opponent off guard.
Players often mistake the situational reaction of a player for mindgames, when they're totally different. There are situational applications of one's mind, which is ultimately defined as "mindgames", but then there's the situational reaction of a player which can be placed under the "mindset" category. The most common example of this is when someone either jumps out of their shield or grabs when they've blocked an aerial. No, this is not a mindgame, it is simply the player reacting to what has been done to them.
I don't know how I got into discussing mindgames, so I'll stop.
In conclusion, simplicity and technicality work side by side to contribute to how you play.