Would it be so difficult to allow for a delete all? It's crazy I have to sit there and hunt and peck to delete messages one by one. It could be a simple force touch option. I've always enjoyed Apple products but 10 years later they still can't seem to get the fundamental things right. Can't wait to see the next whiz bang feature that works flawlessly I will never ever use.
I use iMessage with my spouse - and we send a LOT of texts to each other (we both work). I have to often go in and wipe out our text messages on my watch because it fills up. Swipe left, select Trash then hit Trash again. Ugh.