where a glance is enough rather than reading what the digits (strips)
And modern tape readout is far better for such a "glance", comparing modern aircraft speed indicator with a consumer digital watch is a sign of ignorance, only a non-pilot can make such a comparison. The modern tape-based AI gives you a lot more information than just a 'number'. This is another's pilot take on this topic:
http://airfactsjournal.com/2011/09/a...of-two-panels/