Yes, let's keep on all options on the table. But trying to constant-factor optomize O(code I didn't change) is a ridiculous approach that needs justification,

Yes, let's keep on all options on the table. But trying to constant-factor optomize O(code I didn't change) is a ridiculous approach that needs justification, and the burden of proof is on those that advocate it. Yet, this seem to be the default thing people beg for. Switching to incremental is hard programming, and that's why it hasn't happened overnight, but at least it is an algorithmically sane approach.