I had a Craftsman router that I favoured and used for some 30 plus years that had a work light in the housing.
Needless to say when it worked, it was great, however most of the time the light bulb was burnt out and changing it was difficult, if you happened to have a spare bulb on hand.
I think the reason why more manufacturers don't include the work light is that it just doesn't work 100% of the time, as the vibration of the motor will destroy the bulb filament, plus the debris buildup inside the enclosed housing negated any value of having a light.
This same router ( which I still have ) also came with a single wrench and spindle lock system, to which has caused me just as much aggravation as the spindle lock has now broken away from the plastic housing on two separate occassions.
The first time this happened, Sears replaced the entire housing in order that the spindle lock functioned properly.
Since the last time this happened, this router has been delegated for cottage use only, and is still unrepaired, where it may still get some limited use, but with and extra wrench to tighten the collet.
Just my 2 cents worth.