Well said.
Regarding plastic and lubricants. You struck upon the one I think would be the best: silicone. An alternate would be KY Jelly. Don't know why I didn't think of this before...I've used food grade silicone jelly for O-rings on a shower filter housing and for my RO (reverse osmosis) system filter body seals. I'm near out of the jelly I've had on hand for almost 25 years. I can't find this particular product and food grade silicone has been really hard to track down.
In looking over some videos on RO system maintenance it was recommended to use KY Jelly to lube the rubber O-rings when replacing filters and sanitizing the system. The stuff is widely available and relatively inexpensive.
I have used a silicone grease for some years, a useful product that is worth having in 'just in case'. Before I knew any better, I bought a $2, two ounces of silicone grease from a plumbing supply store and it has come in useful in all sorts of situations. Experts tell me that I should have bought the grease from a scuba store although I have used the plumbers grease on all manner of things with no ill effects, including fountain pen repair.
I have no need for water purifiers and RO but would probably review my choice if things were different.