It's not a waste of slots if you were previously forced to fly half empty at weekends just to hang onto slots.
Avgeek1 it's worth googling the previous BA hub at LGW and why it was closed. MBJ has been operated twice in recent years and keeps getting dropped, KIN remains the port of choice.
Why *would* you replace LHR-DXB with a LGW operation, what would be the business case? BA are struggling on LHR-BKK, Phuket is very price sensitive with almost no business traffic. The LIN/MXP split isn't as clear cut as you make out, they're both LHR routes in the same way JFK/EWR are both served. That's not to say BA couldn't go back to Milan yet again from Gatters