The airport also are offering click and collect for part of the duty free so that is one way the airport is looking at still giving you options for duty free when time is tight
Have you used click and collect?
From my previous experience, you still have to queue at the check out- then there is a lot of faffing with paperwork- even more so if you want to collect on return. It's quicker to pick the item off the shelf.
My last trip through T1 saw almost every single shop empty- I had planned spending £800 in Dixons- but no time ( even though I arrived at airport 2.5 hours before departure)