Many years ago, before becoming a teacher, I worked in an admin role with qualified professionals. I saw a very newly quallified professional make a decision on something that was against policy and could have had serious repercussions so I mentioned it to him. He assured me it was fine, I knew it wasn't and urged him to speak to someone more experienced just to check. He did and I was right.
That doesn't mean that some admin staff are as good as or better than some professionals It just meant that someone who was completely unqualified but slightly more experienced in that area had functional knowledge he didn't.
I didn't suggest that professionals were replaced by admin staff or that admin could do the job just as well as long as there was a professional nearby to keep an eye on them.
And yet, here was are with people suggesting a TA can replace a teacher.
We have some excellent TAs at our school. Long standing, very experienced and get brilliant results from the children but it is all done under the direction and supervision of a teacher because, whilst they're very good at delivering the support or personalised learning individual children require, and they will often have ideas about what will work and make suggestions to the class teacher (eg strategies or approaches they have used previously) that are incorporated, they are not given the responsibility of writing that programme of support because they are not teachers.
That doesn't mean they can replace teachers and it doesn't mean they can do the whole.job just as well just that they have become very experienced in one particular area of it.
That's not to take away from he excellent job TAs do, and, yes, there are teachers who have left the teaching profession who have become TAs but they are not the majority. And yes, some very long standing TAs wil have experience and knowledge that ECTs don't yet have. But they are not teachers.
And that's even before we get to TA pay being crap and schools should not he employing them at TA rates to do a teacher's job.