There's a lot of butthurt on the forums lately. Funny how every single person here seems to NEED 32GB of RAM. How are you existing on your 16GB of RAM older MacBook now?
Honestly, it's tricky and frustrating. 16 GB works fine for me now about 90% of the time. Just would be nice if it was 100%. That percentage will almost certainly be worse 3-5 years down the line when I'd still have a machine I bought today.
First, we're doing things today that we weren't doing 3-5 years ago, like making motion graphics in 4K and soon, 8K. That takes
a lot of RAM. Sometimes you can make do with less, but you'll get much shorter real-time previews, for example. Cameras also push a lot more data now, so if you're editing hundreds of photos in RAW format with 20-30 megapixels, you need tons of RAM.
Plus, a lot of workflows need to switch off apps frequently. I will often have After Effects, Photoshop, Cinema4D, Xcode, Terminal, Safari, TextWrangler, Team Viewer, Mail, and iTunes open at the same time (and probably other stuff like Calculator, Preview, Numbers, etc.). You don't want to quit and restart apps every time you want to switch.
Not to mention the many, many background processes we have running these days that also suck up RAM, like Dropbox and iCloud Drive and Google Drive syncing, Time Machine backups, metadata/indexing, software updates, color calibration, Adobe CC manager, iCloud Photos agent, etc. Right now I'm on my 2011 MacBook Air and I have 3.4 out of 4 GB used with only Safari and Activity Monitor open.