Google is placing more importance on the speed of a website. For developers who outsource or use some slow loading open source systems this is going to make their sites perform slower and get crawled by Google less often. Sites with many advertisements or other additions may also be affected. The software available for web developers is always improving exponentially.
The notion that a web builder system can keep pace with an experienced web developer using advanced software is absurd.
www.hearingaidsaustralia.com is a simple site that performs very well in searches. Check it on a search for "Hearing Aid Prices Australia".
It uses minimalistic code which allows it to load faster and get crawled easier in Google.
It out performs many other sites targeting the Hearing Aid market largely because of its structure and minimalistic code.
Learn more about the importance of building a site with SEO advantages.