Because the description of every single IC2E project reads
"Currently the port is not completely done, some world save incompatible changes may happen, causing blocks or items to change or disappear."
I tried the 1.18, which appears to be completely unplayable. I guess that's not too surprising, but how could I tell since the description is the same as for the 1.12?
What is the most complete version and does it make sense to play it at this time?