Why do all 'maps' made in the 1700's look like... well this?

Why do all 'maps' made in the 1700's look like... well this?
G Projector Map Software
https://publish.obsidian.md/shanesql/G+Projector+Map+Software
Cosmography
https://publish.obsidian.md/shanesql/Cosmography
Coordinate Conversions and Transformations including Formulas
https://www.iogp.org/wp-content/uploads/2019/09/373-07-02.pdf
Longitude
https://publish.obsidian.md/shanesql/Longitude
The Sky Mile Presentation
https://publish.obsidian.md/shanesql/The+Sky+Mile+Presentation