Unlike vaccination where we have data demonstrating effectiveness against each variant for each vaccine and number of doses and time since these doses which can be used to assess immunity; there is very little data on the effectiveness of past infections based upon disease severity, variant which caused the infection, and time since infection to assess immunity.
What data has been published on natural immunity indicates that disease severity (much like vaccine dose and number of doses) impacts the level and duration of immunity.
LinkUntil someone comes up with a means to subcategorize the level of acquired immunity based upon disease severity we (society) run the risk of conferring immune status to those who are at risk of reinfection much like those who are partially vaccinated.
