Comment by lionkor

It is plenty, until you have to work with things like docker a lot, at which point downloading 1000 packages is normal.

Or if you have Steam, and every game wants to push 10-60 GB (!) updates every few weeks - this becomes a "leave the pc on for a few nights" ordeal. With 100 mbit/s, you give it 50mbit/s and an hour and everything is updated - all while you can keep working because you still have 50 mbit/s left.

Or if you have to quickly set up a Windows VM or other VM - not only is the download the longest process of setting it up, it will also happily update forever and hog the network.

Now assume you have 2-3 devices in the network, all doing backups, downloads, auto updates, and your 10-15 mbit/s connection is gone.

Good luck doing a backup, because residential 15 mbit/s download means 1.5mbit/s upload - you cant back up anything. Or stream your desktop. Or upload images in any reasonable amount of time.