It's impressive only if you see Dogecoin as a joke coin and BCash as something so great.

Dogecoin is old. Since it's so cheap it can be used for learning or tests. Very important: it's accepted in most exchanges (most probably in more exchanges as BCash). Some still use Dogecoin move their funds out of small exchanges where they've sold coins you may have never heard of (I've done that too when where trying out mining on certain new coins). Also most probably an exchange will have very low withdrawal fee for Dogecoin. So yes, Dogecoin has its use cases.

The comparison with Bcash doesn't have a chance. BCash is a new altcoin coming into an area many other altcoins do this job wonderfully. When I have transfers to make quick and for some reasons I have troubles with the fees (usually the withdrawal fees from exchanges), the top options are Ripple (!), Doge, Litecoin, ...

This could give a better image on the reasons why transaction activity is not as you'd expect.
And this could be a reason why Bitcoin Devs don't think that bigger block size need attention and that the bigger blocks would bring without coming with other problems all the benefits some are boasting.