Custom WordPress themes can be much more efficient in their code because they only build the features you need and use, rather than stuffing in all sorts of features to try and entice people to build them.
All these extra features can slow down your site. Ensuring your site loads quickly is important not only for your visitors’ experience, but also for good search engine rankings.
And, these extras can make maintaining your WordPress website frustrating. Premium themes regularly have an overwhelming number of pages of options to hunt through to make simple changes. Custom WordPress themes can simplify and streamline your site maintenance work.
A custom WordPress theme can be created to suit literally any design you want. There are no limitations for custom WordPress theme designers. Even better, they don’t start with pre-made boxes to put content in or have to force your content to fit certain patterns, like a premium theme does.