The pound in your pocket would be worth 5%-15% more than it is today, whether you think that is practical or not.
E.g. The devaluation since the referendum has added 6p-7p per litre of petrol at the pump. That has been adding costs across just about all sectors which have been passing them on to customers. That would disappear (from petrol) if the GBP returned to values somewhere closer to where it was prior to the referendum.
Inflation generally would also drop markedly as all commodities, E.g. coffee, cotton, copper etc, are priced in US dollars and suddenly the GB pound would by more, well, per pound.
If you think it hasn’t been affecting you and every single person on the Clapham omnibus, I can assure you it has.
You say you don’t want a debate about Brexit, but its unavoidable when talking about the value of the pound and also the market impact. Surely after yesterday no one can deny what it has been costing us and continues to do so? (And don’t say it is the uncertainty that has been costing us, because that is all part of Brexit and was inevitable both prior to the exit date and afterwards).