Got a response clarifying.
"Each interface can support up to 5A current, the actual current is related to the number of light strips and fans you connect. The amount of this current depends on how many light strips and fans are connected, because it is powered directly by the SATA power port, not the motherboard, so it is no problem."
lol So not only is there no danger of frying anything, I can add a ton more items since I'm not even close to 5amps per header. Not sure if I'll bother to buy anymore since all my visible fans already have frames now. But I'll at least be able to take the 4 other LED strips I have daisy chained off my other MOBO ARGB header and have one less cable visible.
Now if I can only find a RGB program to replace the crappy Asrock Polychrome sync that can't even sync with itself properly. lol Which makes for quite an ironic name they picked since they put sync in it. For some reason on the Z490 Taichi at least, the 3 motherboard LED are only synced with the 2 RGB headers, and not the ARGB headers. So modes that don't let me pick color like wave or water mode, they'll start off as different colors and then run through the color cycles. On wave mode the ARGB all start off as neon green, and the MOBO and RGB headers start off as redish orange, they end up clashing colors and it doesn't look good. On water mode the ARGB usually start off red and the MOBO and RGB start off yellow. But here's the weird thing. Sometimes water does sync properly and everything starts off red if I turn everything off and go to water mode several times until they all show red. But that doesn't work for wave which of coarse is the mode I most want to use. lol Damn Murphy's law... So far the only fix I've found is running rainbow mode since it already has so many different colors at once, you can't see them clash. Or by simply turning off the 3 MOBO LED and not use the 12v RGB headers.