Technically 90 seconds is an order of magnitude more difficult than making a regular link. Not a huge hurdle, but I don't need to read any docs or go fetch embed code to make a link.
Also, often like buttons are used on something like stories, so you're only adding the code to one template, and now you have tons of like buttons all over.
I did the same thing that you did, wrapped it all in a like_url helper.