Presumably people care about write speed because it's typically harder to scale up than read speed as there are just less tricks overall that can be applied.
Like we can assume the overwhelming majority of applications writing to a database are interested in durability. A good portion of those could tolerate eventual consistency on reads, for instance, which means there are considerably more ways outside the database to improve read performance.
Like we can assume the overwhelming majority of applications writing to a database are interested in durability. A good portion of those could tolerate eventual consistency on reads, for instance, which means there are considerably more ways outside the database to improve read performance.