The UK has extremely good care for premature babies, as good as anywhere in the world.
Here is a more detailed paper from the mid 2000s which shows, across developed countries, the survival age for very premature babies fell by two weeks from the start of the 1990s.
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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4438860/#:~:text=The regression lines for each,weeks by the mid-2000s.&text=Extremely Low Birth Weight Infant Survival.
It has since got even better, as you might expect. There is no doubt that, in developed countries, the survival rate for very premature babies is now at least two weeks better than when the 24 week limit was set.
So, bearing in mind that the 24 week limit was based on viability, and that viability is now at least two weeks better than it was in 1990, wouldn't it just be
logical to reduce the 24 weeks to 22 weeks?
A) your graph is US based data again. The same arguments apply as the previous data presented, i.e expensive facilities, excessive and expensive prenatal and postnatal care, differences in demographics, selected demographics, etc.
B) your graph correlates weight, not prematurity, with survival.
C) the preamble recognises the 23/24 week gestational period as the cut-off for viability, as 50%. That is still at enormous odds against the recognised viability of survival in UK as 2.5%, for babies between 24 to 28 weeks. Even 28 to 32 week premature babies are considered to have a survival rate of about 5.1%. That's massively different to your US data set.
D) Premature babies have 0% chance of survival without extensive postnatal care. This sort of extensive postnatal care is only within reach of a very small group of people.
E) the increase in survival rate of premature babies is due solely to improvements in postnatal care, not to any evolution of the gestation period.
F) in the UK, funding for various demands on and in the NHS is a carefully balanced process. The UK does not have the luxury of applying increased funding according to the quality and cost of medical insurance.
To weigh up a holistic approach, with the limitations of funding, is it better to spend more now on the improving viability of premature babies that will demand increased funding in their growing stages due to the inherent risk of morbidities, which will obviously impact on the available funding for the future premature babies and other demands? Or is it better to maintain the status quo and accept that 24 weeks is a sensible cut-off time for termination on demand. That is termination on demand, not some obligatory medical procedure, It's at the request of the potential mother, who does not want to be a mother. It's her choice, and no-one else's.