Why would you call finish? From the DBI docs - Indicate that no more data will be fetched from this statement handle before it is either executed again or destroyed. You almost certainly do not need to call this method. I thought the only useful case for finish is when you absolutely know there are more rows you have not read and you know you are not going to read them. If I had not read all rows but intended to that would be a bug in my code and calling finish might mask that.
As for not disconnecting and letting scope handle it I'd just warn you that this can be a pain to debug if your code is wrong e.g., if you fail to commit a transaction in part A of your code and the connection handle goes out of scope in part B of your code and DBI rolls it back. You'll get a warning of the rollback when the handle goes out of scope at B but the problem code is at A.
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