i have several that plot data ahead of the price and they never repaint afterwards. this repainting of indicators to fit historical data was ushered in by tradestation and developers have exploited this platform design to this day. where most every platform out there is also allowing these systems developers to cheat the public out of their money based on false results. so while it is unlikely you will ever be in possession of a spacecraft that does not mean they don't exist.
Some of what you say I can agree with. I do know and use at least one custom Indicator that at least lets me know ahead of time that price is going to move in whatever direction. It's right 80% of the time and with a little know-how that percentage increases to its max.