I haven't had any problem washing rayon with my regular colored wash (hot/cold, fast spin). And though I don't usually iron my clothes, I do iron for sewing, and I have never melted rayon fabric ironing it, even when at a slightly higher temperature than recommended. If I shake it hard before hanging to dry, wrinkles are not usually a problem. Some rayon clothes I've made have lasted longer than 10 years under these conditions. I also like to use rayon clothes from the thrift store to make new ones for myself, and these have lasted for years too without any special treatment.
And I really like to wear rayon because it's so cool and soft.
That being said, if you're buying it new, there are issues with deforestation, and also the chemicals used to make rayon can be poisonous depending on the process. Here's a pretty good article going into the details of how it's made sustainably and safely or the opposite:
https://impactful.ninja/how-sustainable-are-rayon-fabrics/
There are some kinds of old rayon that stain easily and probably fall apart easily too, but what I've encountered in recent decades doesn't have these problems. So my feelings are, rebuilt or refashion from second-hand rayon and fling caution to the wind!