I'm going to ignore the small % cost differences when comparing.

For decades buyers and sellers have been able to buy and sell items domestically using Aus. bank accounts to send and receive payments for eBay items.
The cost of doing so has always been ZERO. Just as most basic bank transfers between Aus. banks has no charge.
So eBay have now forced themselves into the middle of these normal transfers , and claim now they "manage" it.
I can see they have managed to charge % for what has always been a free transfer, I see that they are guaranteeing their earlier payment of fees, and I can also see they are managing to delay $ transfer times between buyer and seller...so what exactly is the benefit to buyers and sellers ?
Specifically what would be the benefits of forced eBay managed payments for buyer and seller over that which the prior option of  having the choice between bank transfer and/or PayPal payment ?

I'm no staunch advocate for either eBay or PayPal but I am noting people getting bogged down in the fee percentage comparisons rather than the services these fees are actually claimed to be charged for.

PayPal has always charged fees for the service of most often instant money transfers and does function as a stand alone account for members,  from which they can use funds to purchase other goods - whether those goods on eBay or elsewhere.
Paypal has offered transfer services similar to that of Western Union International Money Transfer for those who send moneys or gifts to family members overseas for example, they handle currency conversions, and also offer buyer and seller assurances that many opt for given those guarantees.

The fees PayPal have charged then could be considered in line with a company and fee structure that offers a unique package of services to its members.

For me then eBay Managed Payments vs PayPal charges is comparing apples to oranges.

I am in fact a little perplexed as how eBay have gotten away with it to this point, ie stepping in the middle of standard Aus. bank to Aus. bank money transfers as to glean a % and also slow the transfer time.

I am so puzzled by this I will be contacting appropriate government regulatory departments to see if my speculative curiosity can be appeased.