Can you imagine having such unexpected jumps in housing costs and not even owning your home? That would be way way worse
Now that I am a homeowner with a 30y fixed mortage, I have many unexpected jumps (thousands in home repairs, increasing property taxes and insurance). Unexpected jumps are way bigger as a home owner than they ever were as a renter.
Oh, and my house value has dropped $100k since I bought it.
In general, I live in quite an old house (1800s) and figure it probably costs me a good $15K/year in taxes/insurance/maintenance/other upkeep not to go into maintenance debt. Can be a lot more or somewhat less.
10% is still a pretty serious increase. In France there's an index that is the max that rents can be increased with, and it's usually at max 6-7% (usually lower), and cannot be increased in areas that have significant housing shortage vis à vis demand.
Depends on which problem you're talking about. People getting priced out of the places they live by increasing rents? That one is solved by rent controls. The other big one, of people being unable to find where to live, is compounded to an extent, but coupled with other efforts (highly incentivised building of affordable and social housing, as well as various programs to help people buy the first time, and incentives to buy to rent (at fixed rates) it's not that bad.
All the renter's protections do create obstacles to renting though, with e.g. landlords demanding proof of salaries at least x3 or a guarantor with such salaries.