Standard, for multi engined airliners making ILS approaches.
Indeed it is. A 3 degree slope requires a rate of descent of approximately 5 x your groundspeed. ie. 130kts = 650 fpm or in light aircraft terms, 80kts = 400 fpm. A four degree slope will be a little more, approximately 6 x your groundspeed. ie. 80kts = 480 fpm.
If you're coming down short finals at significantly more than that in a light aircraft, you're more likely to over-flare and cause yourself a problem.
The one thing that connects airline flying and light aircraft flying:
A good landing comes from a stable approach.
The scale and the datums may be different but the principle remains.