What is a PG. to start? 
If we're talking about little dudes who barely shoot and set the table by pounding the rock at the top of the arc waiting for a set play to develop, or otherwise run PnR, that's not really an archetype of significant value in today's game. We have competent ball-handling and PnR action from larger players now, so it's somewhat obsolete. 
And then whitehops hit an important note about general style of play, worthy of a repost. 
whitehops wrote:it's one of the developments with playing 0.5 basketball, which pretty much the entire league tries to do now. that involves every player on the floor being able to make decisions, handle/pass so the traditional PG responsibility is spread out more. wings and bigs have gotten better in recent years so the added size defensively is a plus.
you still need players that can create advantages/get two defenders on the ball but some teams can make that work without a "true PG". tonight the rockets are playing the pistons and both teams are playing their thompson twin at PG more so that'll be cool to see.
You get guys who do volume playmaking. You get your Cade's and your Trae's (and he's even a small guy) and your Luka's and so forth, but distributed playmaking is more common. Bigs being involved in the playmaking is more common. You try to have a couple guys on the floor who can make good decisions so the offense can run even when they're on the bench and you don't look like Utah when Stockton sat and they had to run Shandon Anderson or Howard Eisley, or whomever. Etc, etc.