Copying old designs is perfectly fine - designing things is hard, but it's not the only hard thing out there.

For a trivial example, is it a problem if a silverware company is selling spoons, forks and knives that look like all other spoons, forks and knives? With the intellectual property rights gone, many companies create a business around being efficient at production, distribution and marketing, which are not easy things to be good at!

Another example... We don't need a social media crypto cloud document editor, we need great, inexpensive, fast, polished, standard document editors.

Let's end this idea that everybody needs to be always imagining new things. Innovation is obviously good, but excelling at building things that leverage humanity's collective, public-domain intellectual property is also great.