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.
Well, Bitcoin Cash may have a bigger block size than Bitcoin, but it's heavily centralized today. No one would want to transact using Bitcoin Cash over Bitcoin or even Dogecoin, because of this reason. Dogecoin, although being an old cryptocurrency, has managed to gain acceptance within the mainstream world because it retains decentralization while providing cheaper fees and faster transaction confirmation times. What once started as a "joke", ended as a serious cryptocurrency for traders and investors alike. Bitcoin Cash still has a block time of 10 minutes, which is makes it terrible for micropayments. Of course, with a bigger block size, fees will be able to remain low. But transaction speed is the same as Bitcoin with a 10 minute delay per block. If Bitcoin Cash wants to obtain greater usage than Dogecoin, it needs to lower its block time and become a decentralized cryptocurrency for people to use massively within the mainstream world. Otherwise, I don't see any future for it.
In the case of Bitcoin, a block size increase is not necessary right now. With the adoption of SegWit, Bitcoin changed its block size (now block weight) from 1 MB to 4 MB. This, alongside the Lightning Network, would be everything Bitcoin needs to scale for the mainstream world. In case Bitcoin's Layer-2 solution (LN) becomes bloated, a quick increase from 4 MB to 8 MB will do the trick. It's important to increase the block size (or in this case, block weight) in smaller increments to maintain the decentralization of Bitcoin as much as possible. Extremely huge block sizes like it's the case with Bitcoin Cash and Bitcoin SV, would greatly undermine the purpose Blockchain technology was created for (which is the decentralization of money).
Time will tell us what Bitcoin's developers will do in order to maintain Bitcoin scalable for the world. As long as everything is done with decentralization in mind, Bitcoin will succeed for a long time. Otherwise, you could expect its demise within the mainstream world. Just my opinion