It's those who complain about the quality of Wikipedia whom, in the same vein, complain it's hard for newbies to edit it.
I've had edits rejected and I must say Wikipedia's 'assume good faith' policy makes it less hard on the newbie ego.
https://en.wikipedia.org/wiki/Wikipedia:Assume_good_faith
Maybe newbie edits that don't cut the mark is one of the processes that attempt to drive the quality upward.
Welcomes? Over the years there have been many projects to make Wikipedia more welcoming to newcomers, because WP recognised that the "don't bite the newbies" guidance is nto always followed.
I don't know what it's like now. I'd be interested to see the results of surveys of new editors.