isn't it the natural thing for them to do?
Is living in a cage in a humans home natural?
We can´t compare our captive birds to their wild counterparts.
If we´re talking mating then I think it is a good thing for our captive birds, gives them a way to release their tension. Though breeding is a whole other can of worms.
A friend is nice, a partner is great, but leave it at that. Get yourself a set of dummy eggs and switch them out to avoid offpsring. When they breed in the wild, they are on a completely different diet, they fly all day every day for exercise, plenty of access to unfiltered sunlight, and even when things don´t work out and chicks or a mate dies, there isn´t a human in the middle that will end up heartbroken.
There are plenty of ways to offer enrichment for our birds to give them as close as we can to a ¨natural¨ life, things like foraging, plenty of flight time and a ¨flock¨ (a friend). If you want to explore these more, just ask if you need any help.