Dropping gravel on a torch never yields flint

That is likely WAI. Nobody said that gravel is supposed to drop flint when destroyed while it is falling.

Correct me if I'm wrong, but while searching if this was already reported, I saw several mentions of people attempting to do this to get large amounts of flint, and a few suggesting that it may have been possible to acquire flint from this method at some point in the past.

Can confirm for MC 1.12.1.

Would like to change this report into:

Title: "Loot table for blocks doesn't count for breaking falling block into the item form"

Description: "You can't set loot table for falling block entity landing on slab/torch, so for example you can't block obtaining sand from sandblock with 1.14+ block loot tables"

This bug is confirmed in 1.14 Pre-Release 2 snapshot

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Probably best to forward resolve this into MC-161191 as a duplicate.

Only marking as related for now because this report here still sounds like a feature request, while the example case described in MC-161191 (double slab dropping a single slab) sounds valid. Though I am not sure if the Mojang developers actually want to solve this using loot tables.

This issue duplicates MC-161191 rather than relating. Right now the impression is given that the behavior only applys to gravel, when it is infact a broader issue with all falling block entities, which is already covered in the other issue.

MC-161191 has now been triaged and shows this issue in a more broad way, not just limited to gravel.
For this reason I'm resolving this as a duplicate of MC-161191