IMO the ratio depends entirely on your age. It makes a lot of sense for someone in their 20s to go for a 4x ratio (with caveats, such as fixed mortgage rates).

IMO the ratio depends entirely on your age. It makes a lot of sense for someone in their 20s to go for a 4x ratio (with caveats, such as fixed mortgage rates). It makes no sense at all for someone in their 60s.