What were some of the downsides of the zcash sapling upgrade in 2018 October?

What were some of the downsides of the zcash sapling upgrade in 2018 October?

What were the zcash sapling downsides when the upgrade occuring for 2018 October? I read that all ztransactions need to be transparent in order to use this new upgrade and then one would need to make them private again? Or was this something else?

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