I believe they have their advantages but also not all plastic containers degrade equally. Plastic bottles and topper wear are the cheapest and thinnest plastics you can find + they get hit by high temperatures from the microwave or the sun heating your car, they leach chemicals because they are being burned.
Ya but no one is using plastic bottles and cheap Tupperware for their ATO or putting it in the sun or microwave.
I bought a food grade water container over 5 years ago and still use it. Holds about 7g and was 15 bucks.