It is as simple as the fact that people will often be spending time landside before going through security, and will be often want access to facilities like restaurants.
In general they won’t be as critical for most travellers – you arrive at the airport at the correct time, check in and make your way through security, and only then once you have gotten that time consuming party of the system it of the way relax and look for food and so on.
But not everyone will operate like this. When travellers arrive early (especially those travelling a long distance to the airport and wanting to avoid the risk of being late) the check in may not actually be open yet for their flight, so they will have time to kill land side, or people will choose to wait pre-security so that they can stay with the people dropping them off for a while longer. It also means there are facilities available for people waiting to collect passengers coming off planes and who are having to wait around.
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