Thank you so much for the clarificationPD compatible devices won't hurt the Switch at all, that's why Anker PD power bank is now officially supported. I've been testing ~10 different usb type C 3.0 hubs and hdmi adapters from different brands to no-name brands. None of them could brick my Switch. Surprisingly, the HDMI output function of no-name hdmi adapters work perfectly even with HDD loading.
The only one and known device that could brick your Switch is the Nyko dock.
Anyway, all 2.5" external HDDs (even with none Y-usb cable) and SSD/flash USB won't cause any damage at all to your Switch.
Cheers.