Is it good practice to have hyperlinks in bibliographies?
Maybe I'm a bit late here, but I do think it is among the best practices there can be. I also can't understand why journals' names are abbreviated. IMO providing links is really important for many reasons:


It provides quick access to the cited material (either text or anything else).
If a link is available, checking that source is (normally literally) one click away.
If it isn't, it can be a challenge to get it. If the link is a DOI or other persistent link, it ensures access even if the final link changes. If the link is not persistent, it provides some transparency: the material was online at URL "x" at day "y", so if it's gone it's not your fault but you stated every information you had, and your reader now has some more info to work with when trying to reach that same source (looking for cached/archived versions, maybe looking for other people referencing the same URL who might quote some bigger part or even have an offline copy, who knows...).
A reason for deliberately using a not-DOI URL: "People click on URLs that they understand and view as authoritative", so depending on the domain or subdomain of your cited material's URL, it could be a (not so) subtle persuasive use of that information in one's favor (either a publisher's, a government's, an international body's or any other institution's domain).


And these are just the ones that immediately come to mind now. But I think all the reasons that justify all the efforts to create the idea of DOI as a persistent link and maintain a whole infrastructure around it apply here as reasons to use it.

Actually, the real question could be why not use them (DOIs first, but links in general), and there are as many reasons for not using it as there are for abbreviating journals' names these days.

As to formatting, reason 1 above suggests not using "doi:10.1234/abcd1234" as this is not clickable (unless you manually make each one clickable by formatting it as link etc.), but rather something (automatically) clickable like "https://doi.org/10.1234/abcd1234". 

And providing the last date you had successful access to it is useful as well, for what I mentioned in reason 3 above. (Some styles suggest stating the date of your first access. I can't quite see why would this be more important.)