I am but a lowly moderator, devoting the end of my life support
The dev team consists of one family man, who is not paid for his time on providing this software.
SumatraPDF is built on a core renderer provided by Artifex (Sellers of Ghost Script technology) they are not using Adobe code so viewing methods can often be different.
It is possible to change line weights with GS via commands and in those links you may see where I corrected one users file using a community tool from coherent.
Acrobat has Enhance Thin Lines: When selected, clarifies thin lines in the display to make them more visible. What this means (as you can see from many user links here ) is there is an UNDESIRABLE effect of thickening lines thus the results are inaccurate. In fact many PDF authors mistakenly or as a result of bowing to the majority complaints, over compensate for adobe viewing and thin the lines down incorrectly to zero.
If anyone wishes to correct any pdfs that have the wrong line settings then you can download the community version here https://community.coherentpdf.com/ in the manual see 15.3 Hairline Removal where it explains that a value of 0 = ”The thinnest possible line on the output device”.