Are you saying that 5 minute task every few years is more work then manually lugging 10,000 gallons of water through say, 10,000 separate containers, carrying each one, opening them manually each time, tipping and pouring them, then discarding them? (that's the weight of about 25 cars)
Not to be rude but I don't believe you.
As it stands, I have trouble to descale the washing machine every six months.
I know that the simple table based filters (a can with a filter to filter 1 liter of water) are often not exchanged frequently enough.
Why introduce that risk unnecessarily?
Every filtration system I have owned needs to have the cartridges replaced every six months. What system has multi-year cartridges?
That said, I think plastic can be OK if it is trashed adequately. I don't think my plastic bottles end up in the oceans.
What other-worldly solution do you think the bottling companies are using?