I'm not sure how to read the linked abstract, maybe someone with more knowledge could chime in.

The information I'm missing is what the absolute efficacy of those vaccines is against Delta.

If the risk of being hospitalized while vaccinated with Moderna is "very, very low", then the risk of hospitalization while vaccinated with Pfizer, even if twice as high, would still be pretty low.

I think this kind of actually useful info would be very useful in our current climate, where many people argue against vaccination. "Look, Pfizer is twice as bad as the other! Who knows what the other does? Better not get vaccinated at all!".