I agree that mining ETH with 1660 or 1660ti doesn't make sense right now; better to mine another coin and exchange it to ETH with them.
As ETH is scheduled to switch algos soon, I would avoid choosing GPUs based on their ability to mine Ethash.
https://www.coindesk.com/funding-approved-for-audit-of-ethereums-progpow-mining-proposalThey want to do an audit of PROG and its suppose to be complete sometime in July. So who knows when they would switch.
I agree that they have a track record of not following their schedule.
As GPUs currently take more than 6 months to ROI (barring free power) I would still avoid choosing GPUs based on their ability to mine Ethash.