What the ratings mean for the BOM
The 7.8 mA output drive per pin is moderate — enough to drive CMOS logic inputs, short PCB traces, and the occasional LED through a series resistor. Do not plan on driving relays, long cables, or heavy bus loads directly; that is what a buffer or line driver is for. The quiescent current sits at just 8 µA, so this part is power-frugal in standby — useful for battery-backed or always-on sections of the board. The 10 pF input capacitance is typical for HC logic and will not load down a clock line noticeably. If you are daisy-chaining multiple registers on the same bus, keep an eye on total capacitive load — but for a single device, it is a non-issue.
Lifecycle and sourcing — active, no LTB pressure
The CD74HC574E is listed as Active and ROHS3 compliant. There is no last-time-buy notice, no NRND flag, no obsolescence risk on the horizon. For a BOM line, that means you can commit this part to production without worrying about a forced redesign in the next year.