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It is. Note that OP wasn't criticized for the statement per se, but that PP suggested an amendment to that statement.

It must be equally OK to amend incomplete statements, otherwise we stagnate.

Something like "But I'd suggest..." is a good example for using "'And' NOT Bbut'" [0] to avoid the connotation of contradiction implied when using 'but'. Very useful like in this case where the intention is amendment rather than contradiction.

[0] https://www.psychologytoday.com/us/blog/inviting-monkey-tea/...

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