From what i've learnt over the years, the purpose of the takeaway is to get the club starting on a swing arc that suits your swing. From the original comment, changing your takeaway and backswing will always cause issues with the downswing, until you match them up over time, i suffer from an inside takeaway, always have, but in my transition i loop it slightly, then come down on the correct arc, when i practice fixing my inside takeaway, i hit a lot of shanks, because i am not in the usual position at the top, and of course, when practicing one area, you are focused on that, rather than the whole swing.
If your swing works, without any issues, then don't change it, having a pretty swing is nice, but functional is how you get around the course, so if you have a functional swing and mess with it, expect to have issues until you're able to balance it out, it's why big changes like this tend to be done over winter by most folk.