Currently the definition is similar for both systems. For example, for the printing of plastic films we can reproduce between 150 and 200 lpi with both systems.
The great evolution of flexography in recent years, thanks to digital plates, UV inks, anilox laser engraving, etc., makes it difficult to distinguish between the different techniques. This makes it difficult to distinguish the technique used on a job.
Yes, there are some very elaborate designs to capture the consumer’s attention that require the use of several techniques, making the best of each of them. Wine labels are a good example where it is common to distinguish between them:
Flexography for images. Screen printing for relief. Thermo-printing for metallic effects. Digital printing for variable data.