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Stacking isn't only adding data. Stacking add data that aren't in the previous stacked image. If there aren't any new data, stacking will do nothing.
Stacking is more complex. It adds and subtracts also: noise for example.
Your idea make sense if you think about difference of 10 x 1 minute, total of 10 minutes stacked, and only one with 10 minutes of exposition. But as stacking is more complex than only add photons information ... 10 x 1 minute will show better result than only one 10 minutes.
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