Seems quite the can of worms has been opened on the T1/T3 future. I don’t think Ryanair, easyJet or even BA give much of a care to the overall passenger experience. They all operate from some fairly basic and/or unpleasant facilities across their network. The FR portacbins at Liverpool spring to mind. What Ryanair want is low costs, quick turnarounds and short taxy times. T3 offers them that. With AF BA and KL unlikely to return to T3 that does give a bit more space for based units, even if a reincarnated flyBe were to come back in their previous size. Which is unlikely overnight for Summer 2022?
From what I gather T1/T3 are already operating as one, the T3 gates being used as necessary, accessed by the corridor to/from the old bmi lounges, I think? I dont think there are any open facilities in T3 departures though.