What's the difference between sync and v-model in Vue 3?

Question

Vue.js

If in the second version it is clear why the syntax of the type is needed :value1.syncand that with the help of v-model it was possible to configure two-way synchronization of only one parameter, then in the third version it is possible to pass many values ​​(of type v-model:value1="value2" v-model:value2="value2").
Those. :value1.sync="value1"now you can forget about the syntax ? Or are there situations where it might be needed?