Most of the project's efforts will focus on solving the scalability problem. As in the case of any other crypto currency, scalability is the weak point of ETC.
The situation with bitcoin scalability was the first swallow and we are all aware of its deplorable results (in fact, the impossible size of the commission and the time of confirmation of transactions during the last months). Developers of ETC offer to solve this problem with the help of the sidechain,
Instead of trying to keep everything in one bundle with the increase in the size of the blocks, as in the situation with Bitcoin Cash.