From Joomloa release page:How will Joomla 4 also benefit me?
Joomla4Accessibility
Whatever size your site is, accessibility is a must, and from the start Joomla 4 delivers best in class accessibility. The layout, contrast and infrastructure all have accessibility built in so all your visitors will benefit. We have aimed for W3C Accessibility Guidelines (WCAG) 2.0 (with AA compliance)
Joomla4SpeedWith Joomla 4 you benefit from the increased performance. Speed is one of the top factors in conversions whether your site is ecommerce or you need to grow your subscriptions. Joomla 4 gives your site the boost it needs.
Joomla4Workflows
Workflows help you to run your site efficiently, making sure that the jobs that need to get done are done and by the right people. Combined with the many improvements in the media manager, content writers will love the new workflow and media manager.
Joomla4Emails
Deliver customised emails that welcome and inform your website's audience effectively! With the new email template system it's easier than ever to make the emails your site sends be on message and on brand. Now you can take your site to the next level when communicating with your customers.
Joomla4Search
Search is a boost to any site. It allows your visitors to hone in on the areas they are interested in, increasing engagement and improving your sites ranking. So when it comes to search look no further, Joomla 4 smart search has many improvements over previous Joomla search and is the best to date.This guy from OSTraining found another benefits. However, from from the administrator's perspective, it seems to me that the Joomla 4 interface is similar to that of Wordpress administration
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