I have used this software to create diagrams with my students in class as well at home when taking online classes over Zoom during COVID-19 quarantine time period from March 11th until April 6/7 2020 (over 3 weeks).
It is easy enough that anyone can use it without training or assistance - you just need some basic knowledge about how things connect together which isn't difficult but not too simple either so there are no issues here if someone does know what they're doing then uses their skills correctly once using them will be great!! There really aren’t any downsides yet since we haven;' t had much experience working through all its features however one thing could improve would perhaps include an option where people who don';'re new users maybe give options like "how do i draw shapes" etc instead having everyone open up right away? Maybe something similar should happen before getting into actually drawing out your diagram rather than forcing those.