Many use a footer and a colored one at that. It's hard to say what percentage of sites use a colored footer but most sites I visit do. There's also several ways to skin this cat but all are a little more than the novice should worry about imo. 

​Also........  Why not just add a footer color like header color for easy change in ACP

 

Thank You 

Not clear enough?

Maybe this will help

 

And using a clearfix is not the answer

I like that.  I use a footer on my 3.4.7 IPS site and I was just going to copy and past the code from 3.7 to 4.0.  Click on my link below to see if that is what you are talking about.

​lol...you'll never make everyone happy. Unfortunately.

@csm It wouldn't fit with their design language they've chosen with this current UX. 

Luckily, everything can be customized. You'll have to do what 'Captain Ginns' is doing, creating the change when upgrading to 4.0.

Not sure why flex can't be added to the stock footer... Just a idea as we can throw suggestions out there I thought?...  <----- happy face

​lol...you'll never make everyone happy. Unfortunately.

@csm It wouldn't fit with their design language they've chosen with this current UX. 

Luckily, everything can be customized. You'll have to do what 'Captain Ginns' is doing, creating the change when upgrading to 4.0.

​Not what I wanted to do or was suggesting but captian's got another idea out there for everyone for sure  The footer could also remain transparent to fit there modal

I'm pretty sure you can do what you want with CSS.