This is not my area of expertise so take this with a grain of salt, but my initial instinct was to question why you would need to store the tsvector both in the table and in the index (because the tsvector values will in fact be stored losslessly in a GIN index).
The PG docs make it clear that this only affects row rechecks, so this would only affect performance on matching rows when you need to verify information not stored in the index, e.g. queries with weighted text or queries against a lossy GiST index. It's going to be use-case dependent but I would check if your queries need this before using up the additional disk space.
The PG docs make it clear that this only affects row rechecks, so this would only affect performance on matching rows when you need to verify information not stored in the index, e.g. queries with weighted text or queries against a lossy GiST index. It's going to be use-case dependent but I would check if your queries need this before using up the additional disk space.