I'm starting this thread on the back of this BBC article which quotes Ralph Feinnes saying theatre "trigger warnings" should stop:
https://www.bbc.co.uk/news/entertainment-arts-68267257
He says theatre should "shock and disturb".
Well I do dislike the term "trigger warning" - it's naff. I'm happy with a good old fashioned Content Warning.
But as for doing away with them altogether ... no ... not unless you want to block people who have suffered trauma from accessing theatre.
A friend of mine recently suffered a major trauma and now finds it very difficult to watch TV, visit the theatre/cinema etc., unless she knows that the content will steer clear of certain topics. There are helpful 'wiki' websites, and friends' sometimes watch programmes first and advise her. However, Ralph Feinnes doesn't seem to give a hoot about how accessible his productions are, which is a shame.