In the context of FSD I totally see the blind spot detection as an issue but at that point it doesn't really need to have an indicator for the driver. Today however you should be using it as a backup. There's no excuse to give up good driving practices today, and should always be signaling checking your mirrors and/or shoulder checking, the driver is still part of the redundant system and these systems shouldn't be 100% relied upon on any modern car no matter how good you think they are yet. Blind spot detection is supposted to help you be alerted to when you miss something or the situation changes quickly not to obviate the need to be an alert attentive driver and shoulder/mirror checking. It terrifies me that I'm sharing the road with drivers who seemingly think blind spot detection obviates anything. Also I don't feel like glancing at the screen is any worse than checking the rear-view mirror which is directly above it meaning the transition from one to the other doesn't take your eyes off the road. Also you should be signalling prior to changing lanes not right when you're starting to change lanes so the red lane on the screen should give you plenty of notice. Blinker->swing head past the screen looking for red -> rear view check -> side mirror check -> blind spot check -> eyes back to the side mirror so you have traffic behind and in front in view ->start moving over if clear. seems pretty straightforward