One argument would be
How can you NOT keep track of “keep track of your credit card(s), bank account(s), possibly your significant other's as well, subscriptions, fees, automated payments, cash in/out, taxes, varying income, investment returns, savings, balances on platforms you may use like wise/revolut (for travel) in different currencies, automated "fees" like interest on savings, loans, which may change every now and then, etc?”.
There’s a lot of people who would absolutely panic at the thought that they have all their money flowing around and they can’t even keep track of it.
Also, there’s an argument that if your finances are so complex that you can’t keep track of it (and youre not wealthy enough to pay someone to keep track of it) maybe that in itself is the problem, and that you need to simplify your finances.
Also, is it really that hard? Is it harder to note that you spent money buying something, or transferred money internationally than to actually spend that money buying the thing or transfer it internationally?
And recurring expenses are fairly easy to keep track of with even the most legacy software solutions.