I always recommend a lower cost entry level bike for a newbie for the following reasons:
1 - don't know if you like the sport
2 - don't know if your size is right....you need to determine if you have physical constraints (knee, back...)
3 - a newbie is more likely to crash for stupid reasons....can't unclip...can't follow well in a paceline...poor braking\cornering skills....etc.
4 - you won't appreciate a lighter\faster bike because you haven't spent time riding a lesser bike and you won't appreciate the gains as much. Such as: ride feel, small gains in performance....
5 - the bike is only part of the scenario. Seats, pedals, shoes, helmets, clothing, wheels are all components that add up to the whole package and each can be an endeavor on its own.... So a expensive bike is nothing if the other pieces don't fit.
It isn't a crime but it is worth it take your time to find the right setup for you. Cycling is a sport you grow into.