Yes, I do wear one on each wrist all the time, since end-July this year. The only time I took a break was for 2-3 days when I went to Singapore on holiday with an empty right wrist so that I could go bangle shopping. As it turned out, I found my square bangle to wear on my right wrist on my 2nd day there hehe
What's most important is to do what feels comfortable for you. To me, it doesn't look too much as I feel like I'm a late starter so I'd better make up for lost time
I think my bangles are quite light in terms of weight so it should be ok

BTW, I love your new doughnut pendant - love the lavender-green in it
This hitting of bangle on pendant has happened to me too and I've figured out it happens when putting on earrings and when I'm holding my umbrella with 2 hands due to strong winds. So the moral of the story is, we have to be more careful and mindful of our pendants

About hitting bangles together when wearing one on each wrist, that has happened to me too cos I carelessly bring my arms too close together and also when I'm too excited! So once again, be more careful and don't get too excited