I love teaching, I am passionate about education, I desperately want to do my best by all the kids. I am very knowledgable about most common SEND diagnoses, and I try my best to incorporate small adjustments wherever possible.
But we just do not have the time. As an SEND parent, I can see why you'd think "it's literally 10 minutes' extra work" but it's 10 minutes' extra work per pupil, per lesson. Even allowing for the fact that the same adjustments will often work for more than one pupil, this is still at least an extra 1.5hrs every day.
Well, we finish at 3.45, so an extra 1.5hrs isn't so much? Except that's an EXTRA 1.5 hrs on top of at least 1hr regular planning/preparation, and 1.5-2hrs marking. And of course we have extra curricular expectations, meetings, duties, revision sessions etc etc.
Parents also expect us to be permanently on call to reply to all emails and phonecalls. But all those "10 minutes" have to come from somewhere! They'll either come from planning time, marking time, or SEND prep time.
And none of this takes into account the exhausting nature of the actual teaching! Performing for 5 hours a day, making literally hundreds of decisions every minute, dealing with behaviour, handing out detentions (that's another 30 minutes we have to find from somewhere). So in amongst everything else that's expected of us, the teaching often ends up taking lowest priority. We can't teach positive, fast paced, forward moving lessons when we're exhausted from all the other parts of the job.
Parents are not wrong to want better. But classroom teachers are the wrong target. The whole approach of chucking kids with often significant additional needs into a mainstream classroom, with up to 32 or 33 other kids, and then telling the teachers "just do better" isn't working.