Wrote out a long response but closed the wrong window... the TLDR of it, I don't see it as beneficial at all playing against bots, even if it's your first time ever playing the champ I still think it should be done in live play, that way you can build up experiences, it's all about building up experiences against other players rather an AI.
Hate to break it to you but there's a massive subsection of the community that solely plays against bots and this has been the case for quite some time, it was one of the main factors behind Riot improving the AI in the first place.