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I keep it simple - (FLXXX/10)x3 to calculate my TOD. Apply the applicable corrections for wind and deceleration.
During the descent I simply multiply miles to go by 3 and subtract 2000 if speed is 300 KIAS or 1000 ft if flying at 250 KIAS. 50nm at 300 kts is 50x3=15000. Subtract 2000 and you get 13000 ft.
20 miles to go x3 is 6000 ft. At 250 kts subtract 1000 ft and you get 5000 ft. And this my gate: 20nm to go at 5000 ft at 250 knots, decelerating with a RoD of around 700-800 ft. I do use the V/B function in the Descent page and works a treat. You need to be more conservative if you have a tailwind.
If at 10nm you're at 3000 ft AAL at a speed of 200 knots or less with F1 you're good. You need F5 at GS interception.