That is not what has been declared.
An allowance has been made to the timeframe for medical reasons, including disability, as these can take time to be detected and the woman needs to be given tike to weigh up her options.
For example, Jane is 20wks pregnant and due her anomaly scan which csn be done anywhere between 18wks and 22wks. She's having it at 21wks. The baby is not in a good position and won't budge for the scan to be complete so she is invited back at 22wks.
The 22wk scan detects a potential issue. Jane sees the doctor to discuss her options and opts for further testing. A week later she has the tests, she is now 23wks. Four days later, at 23+4 she gets the results and it is confirmed that her baby has the issue suspected at the anomaly scan.
If the cut off was 24wks for all pregnancies, Jane has just three days in which to seek a second opinion if she wants it, access counselling services, speak to support groups, obtain information on the condition and prognosis, speak with her partner/family/friends/support network, and make a decision.
Should Jane be rushed into that? Or should she be allowed time and space to come to terms with the news and make an informed decision?
If she chooses to watch and wait to see if the issue remains stable or worsens, should she not be allowed time to do so?
There are less than 280 abortions s year carried out post-24wks and every single one of them is for medical reasons, that flexible time limit is absolutely needed for them.