This and some other ticket offices on the Moorgate line are due to be closed by Govia Thameslink, which is more of a problem than the ongoing closures of underground ticket offices, partly because there is of course no general-purpose oyster card to get you round the national network! Having to rely on ticket machines is also a particular issue for passengers in London because:
(1) they do not allow you to buy a rail ticket from the edge of a particular zone (assuming you have a season ticket or freedom pass)
(2) you cannot buy a ticket for a journey starting from a mainline London station – for example, if you have a season ticket that will take you to Victoria, it is very convenient to be able to buy - at AP station - a rail ticket for your journey starting from Victoria, thus saving the time and stress of queuing there.
The ticket machines are also a problem for elderly and less technically minded passengers, and the queues and congestion caused by such people having difficulty using them is likely to inconvenience other passengers.
A consultation run by London TravelWatch - the official watchdog for users of London transport, funded by the London Assembly – finishes tomorrow, Sunday 13th March, at midnight (they are consulting about the closure of 45 ticket offices by Govia Thameslink). To respond to this, email firstname.lastname@example.org, with 'GTR ticket office changes' in the subject line.
You can also of course send complaints to them about other issues (including this one, if you miss the deadline) – such as the planned introduction of ticket barriers at only one end of the bridge at Alexandra Palace Station.