This way, we can point "irrelevant" ASICs like L3+ or D3s to Prohashing to "mine" our choice of coins - avoiding those investment turning into door-stoppers.
In summary, any old ASICs (as long as they are not power hoggers) can be revived and sent to work at Prohashing gulag camp...... and get any coin we want (well almost any coin)
D3's ARE power hogs - but still profitable if you have cheap enough power.
Don't have to use prohashing to get whatever coin you want - can just use an exchange.