In a modern jet, clean at best glide speed, you probably wouldn’t notice much of a difference between all engines at flight idle and failed. It certainly wouldn’t be an alarming sink rate.
Gear down with some flap will be different from normal on the approach. You can stabilise and fly a steeper glideslope using speedbrake and/or speed to control it or come in fast on a standard profile with the speed reducing. Both work and are appropriate in certain circumstances.
I agree it’s a useful learning (not checking) exercise in the sim if you’ve got time but realistically, things like unreliable airspeed, GPWS, windshear, low-fuel ops, runway contamination, etc. give better training value as they are much more likely to be experienced on the line.