Update:
Just FYI, but technically the power all comes from the PSU. I don't know if you heard about the RX-480 but the issue was that the power coming from the main 24-pin cable, then sent to the PCIe slot was insufficient on some cheaper motherboards so you could in fact fry the motherboard.
The RX-480 did have a 6-pin connector, but really should have had an 8-pin or 2x6-pin instead. AMD did a DRIVER update for that fix so it applies every bootup and tells the card to lessen the power load to the motherboard and use the 6-pin input more instead.
Back to the MSI GAMING 1050Ti->
So with the 6-pin connector the hardware can now "decide" how that 75W (more when overclocked) is split up. It could for example end up as 50W via the motherboard and 40W through the extra 6-pin connector.
On the MSI card it's a non-issue, but COULD have been without the connector, if overclocked, AND with some motherboards.
Hope I didn't confuse you.