Basically three things, as I see it:

• As it has already been stated, the fact that it's a very new coin with very low acceptance.
• The addresses follow the same specifications as Bitcoin's. This has made people mistakenly send funds from one chain to addresses in the other, losing the funds or causing extreme hassles in the process.
• The official Bitcoin Cash (equivalent to Bitcoin Core) has the same paths as the Bitcoin Core client. This makes it impossible to run both on the same computer at the same time, at least with the settings they have out of the box.