I think retro is more of a gimmick; every era has popular elements. Applying elements from a certain era in the past to modern products is the so-called retro
I think retro is a feeling/tonal, and many new fashions can be called retro. For example, the curve characteristics of classic cars in the 1960s and 1970s were made into retro sheep electric cars. Similarly, Guofeng seldom uses complicated clouds now, and simple superimposed runway circles can also be expressed. Keep the original feeling modern fashion = modern retro.
In case of failure, quantum mechanics; Style jumping, virtual world; Can't explain, through time and space; Don't know color matching, cyberpunk; Not enough brain holes, parallel universe; The picture is old-fashioned, pursuing retro; Not clear, pay tribute to Cthulhu.
There are some doubts about retro. What kind of elements can be called retro?