The code of your site WILL BE accessible by any web design expert as long as you provide them with the access codes. It means if your website grows, any web developer will be able to work on it and do whatever they want. It is a huge advantage compared to lots of solutions out there where you can't modify the code.
It means as well you are not stuck with us. You can hire any web design company down the road to work on your web site if you're not satisfied with our services.