Yeah I do similar, but mine is super in depth and definitely overkill, but I love having all the details!
I don’t use monzo’s budgeting at all (other than how far through my balance I am compared to the month) becasue I need custom categories and to be able to split transactions. I use a spreadsheet as my main tracking but I update this daily with anything I spend and update account balances. I use moneyhub mostly to verify all the transactions (that I haven’t forgotten any, the amount is as expected etc) and it’s a simple way of checking all my account balances without needing to log in to each account. I also find an aggregator super useful to track accounts that I am using for switching bonuses, to see when the switch has gone through and when the incentive has been paid! One day I will probably simplify it down and move all money to one place (perhaps Monzo) and stop doing so much account switching, then moneyhub will probably be redundant and I’d be able to manage it all in a spreadsheet.
Everyone wants to manage it so differently that it’s impossible for one aggregator/spreadsheet/system to work for everyone!