Stop asking them to change old content.
There are literally dozens of threads in this subforum filled with dumb posts like this. These posts are dumb because they're asking for devs to waste their time with old content rather than creating new content.
If you're going to sit here and tell me you'd rather have old content than new content, I don't even know what to say to you. Go play a wow private server or something, Tempest Keep is calling (and is way harder than any iteration of EC even when it was current).
I agree that new content is better, however, it is much quicker for them to simply scale EC up to 55 then to make an entire new operation. For a lot of people, it will be new content anyways since no one runs it anymore. I would also be ok with scaling it up to 55 and making it a solo operation with three companions, but that would take a lot more work probably.