When I put
www.youtube.com/watch?v=xyz format in a post, the webpage shows embedded player of YouTube (on select sites, see here for more info). But, it doesn't show the embedded player when I use the following URL formats:
youtube.com/watch?v=xyz(Ommision of www)
youtu.be/xyz(The URL we get from share option of YouTube; more accessible on smartphones)
Please, embed videos on these two URL variants, too. Implementation shouldn't be difficult or time-consuming. I think it's a 5 minute job.