It is a wasting because it could be done with staking, that way the could shouldn't need miners.
Yes, but it could end up making Bitcoin centralized. Think about it. Imagine being a huge exchange with a lot of PoS coins in custody? Solely from being a whale, you automatically have a significant influence over the network. In contrast to PoW whereas you'd actually have to dedicate money to buy hardware.
Imagine being Bitmain, the largest ASIC manufacturer having the latest ASICS months before selling to the public.
Not only will they always be able to outmine the general public, the stupid public pays them to continue their monopoly.
Bitcoin is already centralized, Bitmain just splits their over 51% dominance in multiple pools, so the clueless stay clueless.
Staking Coins don't require all new hardware every 1½ years,
ASICS all require complete replacement every 1½ years, that is a hugh investment in wasted boat anchors.
*Note to Profit, you have to sell coins.
In PoS, this lowers the % you control.
In PoW, you can sell every coin you mine and never lose any % of control.