I agree with this first paragraph entirely. That is why both Sunak and Starmer are keen to be in a position to ensure their particular brand of politics will at the next GE hold sway with the UK public. Basically Sunak wants to distance himself and (he hopes) his future government from Boris and the Brexit past, and Starmer wants to be seen to moving away from the 'Corbynista Regime' in terms of 'seemingly being positive' about doing something 'after Brexit'. However for both Politicians any 'actions' they take will only come to the fore when lots of other issues have been dealt with, as best they can.
This will be the key time scale that will either deflate or conflate the new PM's plans and will be affected by lots of other things (some of which Brexit supposedly solved), e.g. a new view to be formed on immigration generally, and Sunak in particular will find this more difficult than Starmer because he has vowed to end the small boats episode first. Starmer has to tie this new found support for immigration in with a proper 'levelling up' plan in all the areas in the UK where expected immigrants are likely to want to settle or, because of labour shortages they will be shuffled off to make up the numbers, wherever. Scotland, as an example, might hold the answer in some areas, as it has a better record than the UK generally in welcoming immigrants, and could be a sort of 'front-runner scheme' but the investment from Westminster will however have to be real and not 'sliced and diced' from existing budgets.
This again I agree with, UK politicians generally want to stay away from anything 'Brexit related' above everything else because the majority of the great British public don't understand any of it, and never did... from the effects of the Maastricht Treat ( and a number of others) to the Referendum itself, the complexities were not appreciated and banner headlines (on sides of buses etc) held sway. What makes you believe it would be any different the next time around...exactly, so they will stay away from it, at least in public. What the new PM and his Government do in private remains to be seen (or guessed at).
I've often thought that had previous UK governments allowed the public to vote on the various EU Treaties that occurred, rather than rubber stamping them through Westminster, before and after Maastricht, as did occur in a few EU countries, (Ireland had two or three goes didn't they) then more might have been learned by the public and Brexit may never have happened at all. However that's water under the bridge now!
Again I agree, well almost entirely, I think there will be a little longer than a year, maybe even two years, depends on Ukraine, what has happened in Scotland in the GE and in particular in NI and has the wheel finally turned and are they heading for a United Ireland now, sooner rather than later. All these things are essentially political but will lie/play heavily on the economy. Starmer has, it seems, already committed himself to a massive borrowing plan, he of course insists its all 'worked out'and not a penny will be wasted; whilst even Sunak has had to give a nod to something similar. Maybe as many people are speculating, there will not be much difference between them come GE day!
I've speculated in previous posts that so much has happened post Brexit, Covid, Ukraine,(Energy costs etc.) and cost of living (some but not all related to Brexit) the failure to stop the blatant/high viz illegally enter via the small boats, etc. and this is beside all the disorientation, caused by partygate, Harry and Megan stepping down as 'Royals' etc. That the new PM just might get two years to plan our future!