It is well known that most people can not afford significant sudden expenses. I think the inability of some folks here to recognize how bad a 4 year rent hike can be have the privilege of not being in that group.
Note this works both ways. If the market goes down, if no one wants to live there anymore, tenants have a lot of room to negotiate. Vacancies are expensive and the hassle of getting a new tenant is not something many people want to handle even in good conditions.
I also contend that not all markets make this easy. I rent a single family home in a town of 4,000. This is not a super liquid market. There are not a lot of good comps - my house is a block from the town’s best park, and walking distance to the small downtown. On the other side, it is a substantially smaller lot than the average house. There are essentially zero houses that are equivalent, and I have to do a lot of digging (including calling up other folks I know that are landlords) to figure it out.
My tenant is not on the verge of financial collapse. They’re a manager at a local business, they probably spend about 20% of their gross pay on rent. They have demonstrated an ability to absorb the bump without issue.
I think people that are arguing bigger rent increases that happen less often are bad are assuming tenants are stretching their housing budget to the max and won't be able to afford the large hikes. In which case they wouldn't have been able to afford it with smaller increases either.