In some B2C cases, and many B2B cases, the market demands a minimum acceptable product. A minimum acceptable product is a minimum viable product plus a few (not too many!) niceties people expect in a quality product. The niceties could include items like the password reset option and other generally accepted features. A minimum acceptable product still should not be developed in a vacuum and driven with close customer input. One rule of thumb I like is that the minimum viable product should be built and launched in 90 days with the minimum acceptable product no more than 45 days after that.