Some floor materials handle weight better than others. Very soft wood, some laminates or delicate tiles can dent or crack under heavy, point-loaded furniture like big wardrobes, solid bookshelves or large cabinets.
If you know in advance where these pieces will sit, you can factor that into your flooring choice. Maybe you choose a more robust material in those rooms, or you add proper furniture pads and distribute weight properly.
It also affects layout. You might avoid placing the heaviest piece on a joint between floor panels or at the edge of a weaker area.
Thinking about furniture and flooring together avoids surprises like dents that only show up once all your expensive pieces are already in place.
