If you didn't use JS for date pickers, you didn't have very inclusive browser support - especially for something like a healthcare website. [1]
Were the designs and layout of these SPA and HTML5/CSS3 website also identical?
Were the designs and layout of these SPA and HTML5/CSS3 website also identical?
If it's intended for business users, particularly if on an intranet site, it's often very easy to limit the number of browsers and versions you need to support to just a handful.