According to the chart in this post:
It oscillates then stabilises stabilises HIGH after around 100ms when the ESP is booted. So it could be LOW briefly during this time, but that won’t be an issue in most cases.
For someone who’s just wanting to connect a DHT11 and a couple of switches, and is a newcomer to working with ESPs, there’s are better pins to choose.
More advanced users can safely use almost all of the pins on an ESP, as we know what to look out for and how to choose appropriate pins for specific uses. But as a rule of thumb for newcomers it’s better to steer them away from the pins that may bite them in future.
Pete.