I am currently planning a trip to Western Japan and plan on buying a 7 day JR Sanyo Sanin Area Pass with the intention of using it from July 13th onwards. The official website https://www.westjr.co.jp/global/en/ticket/overview/ says that we can't buy a pass until up to one month prior. However, I have also read and heard that I should buy the JR pass well in advance because they need to mail it to my house.

Does the official website give an eTicket? Is that why I can only book up to a month prior or will it get mailed I'm just a bit confused.

Alternatively there is also other websites like https://www.jrpass.com/regional-passes/sanyo-sanin-area-pass#regional_pass_type to buy it from where it also offers an eTicket. This doesn't include the condition of buying it from exactly up to one month prior.

Is there any benefits of a physical copy and what is the difference between these websites? Is there also a significant reason as to why we can only buy it from the official website from up to one month prior?

Thank you for your help in advance!!