Pooks not really ok about breastfeeding stopping but it's out of my control due to multiple issues covering both baby and I.
My little one also has a poor suck, on the test the LC did she took eight sucks to get milk through the tube when she should have taken no more then three. We are also dealing with an oral aversion so makes feed time quite stressful.
Yes I had to stop breastfeeding because... I had to! And it still hurt. I went through a grief process but it was delayed because I needed things to get sorted with DS first, but then it hit me like a tonne of bricks later. But I will tell you this, it is a relief when you see them feeding. Just feeding. That's all I really, really wanted by that stage. DS had some similar issues, I found a dummy really helped him although he needed some persuasion at first to take one. I do think it helped his suck, it certainly helped him get some lovely saliva going after feeds to help with the acid in his throat. Look, he was losing weight and a miserable baby, then by 4 months old he was drinking 8x 200ml bottles of thickened formula a day! So as hard as things are now, just remember that the thing with babies in that first year is that there is constant change. Things will get better.