Ideas about moving live rows to the top of the table

I read about the utility – https://github.com/dataegret/pgcompacttable . It is more careful about resources, because it works on slightly different principles. The main point of pgcompacttable is that it moves all live rows to the beginning of the table with updates in the table. And then it starts a vacuum on this table, because we know that we have live rows at the beginning and dead rows at the end. And the vacuum itself cuts off this tail, i.e. it does not require much additional disk space. Let the auto-vacuum or some other process do this.