... get a playable middlegame and all good!
That's my opening mindset, as well.
A lot of players argue about "fighting for the advantage" in the opening. They squabble about move order and centipawns. And I understand the emphasis on precision.
Though, I believe most players can reach success by simply reaching a playable game out of the opening ... then striving to outplay their opponent from there.
Save the centipawn worries for when you reach a higher level.
Mind you, "playable" means different things to different players ...
There's nothing wrong with 1. a3.
White is just playing a colors-reversed opening, with the extra move a3 already played.
For example, if Black replies 1. ... e5 then White could play 2. c4 with a colors-reversed Sicilian in which the move a3 is almost certain to be useful.
Similarly, if Black plays 1. ... d5 then White could play a colors-reversed Benko, or a colors-reversed Queen's Gambit Accepted; in either of which the move a3 will be useful.
It's not a great move, but it's not as worthless as it looks at first sight.
That's the point.I am not playing highly theoritical lines.....i can even mix up everything and play and no one will be able to beat me in the opening.I get a playable middlegame and all good!