More pressure on 18M pax limit with these planes having more seats, just like with Wizz with 321s and EZY with 320s.
I note El Al is majority 737-9s now.
Is it up to the Airport about arrivals routing, these were signed off with NATS/CAA years ago? I don't think anything goes below 8,000 in Huntingdon area and Luton ATC does a good job avoiding the routing where it can subject to STN arrivals & departures, mix of LCY & NHT traffic and the occasional heavy out of LHR on full throttle but climbing slowly.
Wait until Cranfield gets busier......