I disagree with this one point. Floating smart rollers absolutely feels like riding your bike outside, in terms of actually "riding your bike" vs. just peddling on a fixed trainer. Combined with Zwift or FulGaz on a big screen TV it's a pretty good substitute. You can also ride real life routes created with RideWithGPS or Kamoots that have been ridden through an Elemnt Bolt which adjusts the resistance based on slope of the real route. There is also a wind adjustment that replicates wind drag.