Separate serviceable connections
An external leak or operating control may pose a different decision from a damaged housing. An assessment should identify the actual source before a replacement is proposed.
Set a sensible decision point
Discuss the findings and proposed scope before authorising work. No fixed lifespan or universal saving can be promised. This is an existing-appliance enquiry, not an offer of a new installation.
A useful distinction
A replacement decision may also depend on the existing sink connection and control arrangement. That assessment is separate from promising that a newer-looking unit will fit the same space or solve a downstream drainage fault.