Miners' attitude kind of drives away business, y'know.
Even making it darn near free for them to mine a coin doesn't get them on board so coming up with technology that does not need miners at all becomes a necessity.
Long long ago CDN, MBC, UKB, UNS, NKL and so on moved away from using blockchains - moved away from using/needing miners - because it became clear that even bending over backward to accomodate miners by making a coin capable of being merged-mined right alongside Bitcoin using the same hashing power the miner is already using was not going to work, was not going to adequately secure the blockchains.
Bending over backwards isn't enough for the miners, it seems; they require everyone to bend over forwards instead. So to speak.
Miners evidently cannot be relied upon to do their part in securing blockchains even given merged mining; even though the marginal cost of merging a few more chains is almost negligible.
Miners thus became a big liability that blockchains accrue, making it more and more necessary to find alternative methods of securing ledgers / consensus.
-MarkM-