After extensive testing on live I have determined the following.
Netherite pickaxe debris rate is ~1/1100 blocks mined.
Diamond pickaxe debris rate is ~1/1500 blocks mined.

I'd like to present the case for boosting Ancient Debris rates for Netherite pickaxes.

1. The current rate is ~1 debris/1100 netherack mined with a Netherite Pickaxe. This means, one has to mine ~13,200 netherack for enough to make make 1 netherite ingot.

2. One unbreaking 3 netherite pickaxe breaks about 8500 netherack. In order to repair netherite pickaxes, the most efficient method is a netherite pickaxe factory. From this factory 1 neth ingot makes 2.667 unenchanted pickaxes.

3. So Cost of mining 13,200 netherack is 1.55 Neth Pickaxes, meaning per netherite pickaxe mined out, I am making a profit of 1.12 netherite pickaxes. However, the cost of making the initial pickaxe is either 1 neth ingot OR I can risk enchanting, and in many cases, it costs more than 2 pickaxes to get an eff/unbreaking 3 netherite pickaxe.

4. So sunk cost of making a smithed netherite pickaxe, that's 1 ingot. So -1. Then say I get 3 repairs, that gives me extra cost of 1.12 netherite ingots. Now I'm at -2.12 neth ingots to get 34,000 netherack mined which produces (currently) 2.58 netherite ingots.

5. 2.58 netherite ingot revenue, 2.12 netherite ingot cost. All of a sudden I am up 0.46 Netherite ingots after mining 34,000 netherack. This is not accounting for initial enchanted diamond pick production, and doesn't account for xp cost of repairing, it doesn't account for cost of repairing the Neth pick factory or adv ore smelter.

This is why the rate must be better

I can see it looking more appetizing if debris rates were either doubled. OR you boost the Netherite pick bonus to produce 50% more ores, or reduce debris cost in the netherite pick factory (currently its 3 ingots for 8 vanilla Neth picks). Or some combination of the above.

If I mined the same amount of netherack out with just diamond at the 1/1500 rate, I'd get 22.6 debris profit or 1.88 netherite ingot profit.

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After all the fixes being talked about in #announcements etc. The debris rate hasn't changed from what it has been for the last several months. For 1 day, when Wingzero initially fixed it, the debris rate with netherite was 1/800. Since then its been reverted to about 1/1100 the same as before.