For normal use like that 16GB is generally just fine. Some games can use enough that you’ll need to close Firefox and other RAM hungry programs though.

As far as needing more than that, people who do heavy design work or edit videos and that kind of thing generally do. For example 32GB running Fusion in Davinci Resolve can be a bit limiting sometimes with higher resolution or 10 bit footage.

That ones actually fine IMO because they advertise Mbps which is fairly clearly different from MBps (b vs B, bit vs byte), and very easy to convert between.