I get what you are asking, but it is kind of like " how long is that piece of string?"
Also, I am wary of derailing @Satur9 thread by even asking my own question of @Vicarious
But I feel It kind of fits " Number of implants poll"
If @Satur9 doesn’t mind me answering your questions here ( I will be brief )
PLEASE BEAR IN MIND, THE ANSWERS BELOW ARE SOLEY MINE AND NOT NECESSARILY THOSE OF, NOR ENDORSED BY DANGEROUS THINGS AND THEIR AFFILIATES 
*another disclaimer, this is probably going to come across as , rude, abrupt, defensive. That is not the intent, merely, pointed statements for brevity and clarity. So apologies in advance 
*
You have kind of answered your own question by diving into this implant world yourself.
Huge question when you break it down with far too many answers to publish that here
This is definitely arguable depending on your stance, My answer to SKEPTICs would NOT be any of the ones listed HERE, I simply wouldn’t waste my time trying to convince a skeptic, By their nature they are closed minded people, I REALLY don’t care what they think!!! (Which is why I never posted in that thread)
HOWEVER a person who is UNSURE they are going to be more open-minded and willing to learn, These people, I will happily give them all the time in the world and bend over backwards for, and do my best to answer any and all questions I am able to.
The answer to that is throughout this forum, but to break it down ( we could go further, but for brevity sake)
Security, Access, Personal data, business cards, projects, health, party tricks, discreet data storage, conversation starter…
Surely the question should be, WHY did it go wrong??? experience, amateur vs professional ( even “professionals get it wrong” ), ill-informed, lack of: Research, experience, technique, hygine…
How often does it NOT go wrong!!! ( just sayin’ )
Again, I would say there is no typecast for either, it can come down to a whole modicum of things: access to professional installer, previous experience, medical professional, financial, time, knowledge, logistics, part of the whole experience…
There is no repository for your specific questions, but all the answers you seek lie within the Forum that is…Dangerous things 
Great stuff, and I look forward to seeing you on this forum.
Remember, if you have any questions about your install and implants, don’t be afraid to ask, I promise, the answers won’t come across as curt as these ones.
I truely hope no offence taken
ANSWER to How long is a piece of string?
twice as long as half its length!