Does it make sense to replace all Honda windshields with Lear style ones because they are 'more secure'.
It does make sense to do so if the Lear style windshield is not only more secure, but also less expensive than the Honda style. Better and cheaper. No brainer.
I'm sure nobody would be able to make a transaction solution which is cheaper than real time flooding of the entire network with every transaction and keeping every transaction on every autonomous node in perpetuity...and every 'coin' (aka UTXO) in the currency system in memory.
It sounds like you're trying to make the point that keeping LOTS AND LOTS of copies of an entry in a ledger (i.e, the blockchain) is expensive. Like, I buy a cup of coffee, and this single transaction gets recorded LIKE A ZILLION TIMES all over the globe.
Is that what you're trying to say? If so, my response:
The number of perfectly identical copies of a single transaction is much less of an issue than the number of distinct ledgers and distinct ledger entries for that transaction. Did you ever stop to think about how many different ledgers/ledger entries does it take to buy a single cup of coffee with a credit card? This one transaction involves a complex flow of money that involves the customer, the merchant, the credit card, the POS (like square or paypal or whoever), and maybe more. That's at least 4 entities and with double entry accounting, there are probably at least 8 different tables that record this one transaction. I bet it's actually a lot more than that. At some point in time, multiple people have to make sure that all of this record keeping is consistent among all these different databases that are built and maintained by different people with different levels of expertise, using different conventions, different computer languages, etc etc. Suppose there is a discrepancy; which table contains the error? It's this process of reconciliation where the expense comes in.
When you go through that exercise, suddenly having one transaction recorded in ONE ledger that everyone trusts and refers to, sounds pretty simple. Who cares that this one ledger is duplicated many times over the globe?
Of course, we're not there yet. It will be a long time before we abandon the legacy fiat system entirely. But it will happen, eventually. Until then, we have about a zillion different ledgers spread across the planet, and we gotta make sure they alway stay reconciled. God help us.