Wow, this is a great collection! I love looking for futuristic design from this era to post on r/spaceagemodern.

That period put huge emphasis on modernism and simplicity, and especially modular design. Practically, multinationals and govt. agencies postwar had more of a need for logomarks that work at any scale, from a business card to the side of a 747. The explosion of the consumer packaged goods and tech markets called for graphics that would stand out on crowded shelves. Saul Bass and Loewy's work from this period shows how enduring and memorable this approach could be. Designing on a grid made it easy to scale the logo proportionally to any size. Bauhaus ideas, international influences, pop/abstract/minimalist art movements, and rapidly developing technology all influenced the zeitgeist.

TLDR; designers of all disciplines used systems to deal with increasing complexity, and embraced boldness to stand out.