I disagree, but I do agree that there are better options available than JPEG. Lossy compression is actually what allows much of the modern internet to function. 4K HDR content on Netflix wouldn’t be a thing without it. And lossy compression can be perceptually lossless for a broader range of use cases. Many film productions use high quality lossy formats in their production pipelines in order to be able to handle the vast amounts of data.
Of course it all depends on the use case. If someone shares some photos or videos with me to keep, I’d like them to send the originals, whatever format they might be in.
Some features/plugins can be quite taxing on the system and in extreme cases it can slow the editor down to the point of being unusable. I’m a happy Neovim user with a LazyVim setup, but I experience this extreme slowdown for some JSON files and I haven’t looked into it yet to see what causes it.
You can let your editor do the same compute intensive or memory hogging things that a GUI editor does. The fact that it runs in your terminal doesn’t make it lightweight by definition.