To me, there has never been a more clear reason to spend the extra $200 more. For that $200 you get better GPU with nearly 40% more performance, significant camera upgrades and versatility (LiDAR as well), ProMotion, 6GB of RAM, better battery life. Apple has finally separated the Pro from the non-Pro models in a very clear way other than an extra lens.
As nice as those additional features are, when the standard iPhone 13 starts at £799, the extra £150 can be pushing the cost to an uncomfortable level for a lot of people. If people keep the phone for longer than 2 years it might spread the expense a little better, but in the short term I think the 13 still offers enough of a good package for anybody wanting the latest iPhone IMHO.
The Pro is currently £949 here and Apple have reduced it by £50 from last year to encourage people to buy the better model, however the standard iPhone has increased by £50 too. I sometimes think they should just produce a Pro at £850 and forget about releasing two models. I also wonder how long they can release a standard iPhone with just a dual camera system when it’s such a high price compared to other manufacturers in the market.