This is mostly about tuning for performance for SEO - its amazing in 2018 that sites are delivered with unoptimized images - its not rocket science to use Photoshop or run all the images through a cli based tool.
Agencies are only concerned with speed of putting content online and don't have time for that. Mom and pop, 80% of the internet, are only concerned with getting content online and haven't a clue what anyone is talking about cause they leave that up to their high school age kid for that.
Designers have become "coders" but aren't versed in the area of the science of computers and networking. Thus we have given to us Wordpress, Wix, Squarespace where you, too, can become an internet web site developer!
Designers have become "coders" but aren't versed in the area of the science of computers and networking. Thus we have given to us Wordpress, Wix, Squarespace where you, too, can become an internet web site developer!