The huge mistake of Metaquotes with MT5 was to create a new product.
It was necessary to migrate MT4 smoothly to MT5 by ensuring full compatibility with software written for MT4.
Let us not forget that MT4 corresponds a bit to Windows XP, it will one day have to migrate towards something more modern at the level of technological foundations.
When you see the speed of a back-test on a modern platform, it still makes envy
If really the time has come, we will have to move to MT5. But if possible smooth, with at least a year with the two platforms available at Darwinex.