Lots of altcoins are fast and cost efficient. The reason they are, though, is because no one uses them, so none of the blocks are full and thus there's no compe

Lots of altcoins are fast and cost efficient. The reason they are, though, is because no one uses them, so none of the blocks are full and thus there's no competition to make your transaction in via fees/tips. It's the same way that tons of altcoins claim they scale 10x better than Ethereum because they only have 1/100th the volume.