You have to try it for yourself definitely, to see if changes work and the bike is still comfortable. Bike fit will tell if the changes work or not.Exactly, things change. Now a slammed stem is slower than a non slammed stem, tires are getting much wider on road bikes with no speed loss. Geometry changes with nearly every new model year. The Creo 2 alloy has slightly different geometry than the carbon versions. You just can't base things solely on geometry as to whether a flat bar will work on a drop bar or not. The whole industry started as an experiment which is why we have so many different types of bikes for different styles of riding and within each discipline the different brands have different geometry and designs that they feel work best. You never know what's best for you unless you try many different things and that's ok.
I guess the idea of spending a lot of money for a shiny brand new drop bar bike only to immediately make such expensive changes feels high risk and expensive. I've changed plenty of bars on bikes in the past, but usually after owning them for a while and curious about a change. Some worked like this one- 26er MTB with full swept back bars, very comfy and still use:
Some didn't work like this one, All road, drop bars with swept back bars but was just too cramped. That bike- a medium Croix De Fer, was already a bit small for me & a bigger frame size to start with would have helped. Was stupid to try, but you live and learn. So it's always an experiment.