It is interesting how the marketing has changed over the years. It seems it wasn't that long ago that it was trumpeted as both gold and digital cash. With the scaling debate and fee increases though the digital cash angle has taken a backseat to the digital gold narrative. And in fairness it was originally conceived as "bit gold" so maybe this is the inevitable end point of any crypto asset; it eventually runs into scaling problems and then relies on some additional layer to create the cash part.
Well, you can't sell it as both. There's only one way: digital gold. Big blocks kill the digital gold feature, which kill the digital cash feature too (you can have digital cash when digital gold is not an option), since big blocks centralize the network.
With conservative blocks, you can get digital gold, and you can build on top a second layer, which is debatable if it would be considered digital cash or not, but it's definitely more private than traditional payment systems and fiat currencies.