Remember crypto kitties on the eth. Eth blockchain almost stopped because of the small app. That is why scalability is very important especially for the blockchains with smart contracts.
Funny thing is that ETH was clogged because of such a useless application. When will we see something really substantial clogging the network? I think scalability, for now, is more than enough. We need to focus on real implementation maybe, rather than scalability that no one needs for now.