So you do not lose your server population. A lot of people leave when they are under the impression that the server is not working at peak performance.
I stated before "Who wants to play on a broken server?". I stated that most of your plugins commands can be met with more time and research. I have elaborated on these points and gave consideration to the plugins capabilities over basic commands... What more do you want from running around in circles of your own questions which I have already answered?
Also may I remind you to the fact you are a newer user to minecraft which gives me a little more say over the matter?
Hello, ignorance! You really just shot yourself in the foot with that, throwing all your good hard work out of the window because you can't address something with factual evidence over your own self-formulated opinion!
I also want you to point out to me instances of plugin failure like you are claiming. Never, in my time of playing on plugin servers or hosting them, have I seen them become "Deleted or Corrupted" - and if they do, that's a problem with the code of the specific plugin, not plugins as a whole.
As well, I want you to realize that older computers can't handle the amount of red stone and command block calculations that are required for most advanced setups. You'd be efficiently alienating part of your potential player base by running lag-inducing setups that plugins avoid by being completely server-side.