I think the main issue with the handling agents is that they can't access the belts to drop the luggage, as even though many passengers complain about delays of an hour for collecting luggage departures don't really seem to be affected so the holds must be empty for the new luggage to be loaded.
At the moment the biggest bottle neck in the terminal is international baggage reclaim with a capacity of 1,370 passengers per hour and that won't be fixed for a couple of years. This equates to just 6 Wizzair A321's but the airport allows for a proportion of passengers to have no hold luggage.
This is what a report commissioned by the airport said in 2012 based on 2011 passenger figures before the big rise in Luton's passengers.
Baggage Reclaim
As with check-in above the stated capacity relates to the capacity of the reclaim infrastructure and excludes the proportion of passengers without hold luggage. Based upon the observed proportion, the effective capacities of the reclaim facilities increase to 1,960 for international arrivals and 700 for domestic.
The analysis of the available length of carousels indicates that capacity is likely to be adequate (2012). It should be noted however that this is achieved from relatively few, reasonably long carousels. An individual carousel therefore handles a number of simultaneous flights.