Googling for
"tipping point" "three contestants"
appears to indicate that just about every newspaper in the country has covered the story but they all seem to quote the same information which, while announcing the change, fails to explain it. e.g.
https://www.birminghammail.co.uk/news/showbiz-tv/itv-tipping-point-announces-permanent-23660828
Like so many things (e.g. the way that Microsoft keeps changing its software), it probably comes about simply because there's an employee somewhere whose job description requires them to keep coming up with (so-called) 'improvements'. If they can't think of a new way to do things, they'll be out of a job, so they keep 'improving' whatever it is that they're responsible for, even though nobody actually wants to see their changes brought into effect!
Cynical? Moi?
;-)