I mean if you drop the TFO requirement it’s easy - just open many connections. But just fetching many resources isn’t sufficient to want QUIC - you have to be doing so immediately after opening the connection(s), the resources have to be non-trivial in size (think 10s of packets, so the text of a note generally doesn’t qualify) and have a need for not blocking one on another, which is generally not the case on a mobile app - server can send the first three things you need to paint the full window first and then more later.