ECG is on its way on Active 2. See Samsung 2020 Unpack link below if you want to hear it directly from Samsung.
Galaxy UNPACKED 2020 - The Official Samsung Galaxy Site
The unpacked video says approved in S. Korea and "working with other countries for approval". No word when. I bought the Active2 watch explicitly for this ECG feature which was "coming real soon now" last fall. Zero movement as far as I can tell. Anyone know of a trade in policy for the Active3? Simply unacceptable behavior.