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It does tend to lend itself to you wanting to be lazy and drag and drop titles/description and if you do that you will get higher rejections, but certainly if you want to increase keywords in your campaign (and particularly at the moment with the DTC being as temperamental as it is), then using the bulk spreadsheet will be beneficial.
I think a lot of advertisers have used it to cookie cut a bunch of keywords with ham titles and descriptions and it is for thatreason it is not an "everyone" facility. The few spoil it for the many.