Another reason is needing to support old browsers in SaaS for enterprise. All the new sparkles and rainbows are great design, but often also require the newest

Another reason is needing to support old browsers in SaaS for enterprise. All the new sparkles and rainbows are great design, but often also require the newest browsers to really use. I've never worked in an enterprise environment that didn't still have to support IE8. Enterprises are slow to move on this.