[jjnoakes]

I think the cost savings is more than just the cves. You also get faster features and have to write fewer tests. You can use higher level abstractions with fewer rough edges. You may even be able to take advantage of the ecosystem more.

And you don't have to rewrite everything at once, you can do it at the function or file level bit by bit. Perhaps the parts that are changing the most are done first, or perhaps the parts with the most bugs.

I'm still not saying rewriting is always right or wrong, but I think it isn't as cut and dry as some make it sound.