As for me aren't a good point to check overall life. As a quick tour/system check it might work eventually. But there's always a chance that something can go weird, even on a new one (heard that RTX 3x got a lot, a lot of defective ones)
Ex. I have ma RX580 on the second PC (my older pc), and there's kind of problem when GPU completes those tests (no matter, FurMark or something else) but in games (like Forza Horizon 4, or heavily modded Skyrim), it will crash if I don't play with a slight downgrade (no, it's not about overheating and isn't driver/system or whatsoever related)
Once I lost my mind and tamper and disabled all fans (except GPU's), even closed airflow with a rug and left for about 6 hours thinking that I will overheat or kill GPU.
Nope, still in one piece.