I know this is common and my ds3 even did it too but there seems no end in sight.
Dd is 2.5 and has been dry a little while now but has never done a pooh anywhere but in a nappy.
She knows she needs to go but comes and asks for a nappy. We always try to persuade her to use the toilet or potty but she gets upset and says "noooo"
She is inclined to be a tiny but constipated so I don't want her to start with holding.
I've just gone with it for now but feel that now I may need to think about pushing it a bit or shall I just leave it?