The GRAVITY portion of this statement is 100 % untrue. Reverse fluid flow is what cycles the check balls.

How about posting your statement to the QA department of these professional transmission rebuilder trade magazines?

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As for other statements in this thread. If the valve body is that varnished up, it needs removed, washed with solvent and valves cycled. It may even need a complete disassembly to fully clean.

Changing the fluid multiple times _might_ do something if there is ample mileage between changes. ( As in 5 K ) But a valve body pull and clean is immediate.

An additive that swells seals? Some brands are pretty much the same as regular brake fluid, give them a smell. Sure, both will swell seals but what tells the swelling to stop? If the clutch drum seals swell too much, the pistons will stick in the bores, piston not fully retract, clutches will drag resulting in trans failure.

Yes, an anti slip / leak additive might get a trans to limp along but it isn't a permanent fix.

The only additive that does any good in an otherwise properly operating trans is a "shudder fix" friction modifier. This reduces the slip / stick chatter that some transmissions suffer from especially when the torque converter clutch engages. This additive is similar to the additive used in limited slip differentials to reduce stick / pop when going around a slow tight corner.