We used polypropylene hoses when they built a bunch of the barns at the farm. Most of that stuff is going on 30+ years. Over the past two years I've started having to repair elbows and T's because they corroded so bad.
The *b-word of it is that they don't make PPE hose or fittings anymore and PEX won't work unless you use a PPE to PEX mender.
They don't make the copper fittings like they used to 30-40 years ago. A lot of the PEX fittings I put in about 5 years ago already had to be replaced because they corroded.
Recently I started using plastic fittings, hoping they will last a little longer.