Already answered on Kitchens forum.

Around here water varies between 26-40 gpg hardness so softening is a must to get reasonable service life from appliances and plumbing fixtures. Without (competent) softening water heaters last about two years on that water.

Our fridge with ice maker was installed in 1996 and it has never missed making an ice cube... there's an RO on it.

We use RO water for cooking, drinking and making coffee. I have never had to descale my coffee maker which was purchased in 1996.

RO water has been very good to us.

As was discussed in another recent thread, there's consistency in the scientific evidence suggesting that demineralized water shouldn't be consumed. Both because of what winds up in it, and what is taken out (minerals essential for metabolism). I think you've summed up the issues pretty well. Interestingly, one study mentioned in the attached paper found that important nutrients and minerals are leached out of food when such water is used for cooking and preparation.

Everyone can make their own decision, but it's not something I'd ever want in my house. The WHO (in the attached link) advises against it.

Here is a link that might be useful: WHO report