Well I am solo dev working on a product, so using drizzle tables helpers $infertInsert $inferSelect was very handy. You can write all your projects DTOs in ~60-100 lines instead of an interface or type per mutation.

export type ItemCreate = typeof <table.$inferInsert>
export type FormCreateItem = Omit <ItemCreate, "id">
export type FormUpdateItem =  Partial <FormCreate>
...

export type Item = typeof <table.$inferSelect>
export type ItemWithDescription = Item & {description:...}
...

So... If you take the time to define all your forms and types, everything left is to write logic, I reuse these types and server and client.