I think you are looking at this from only a download speed perspective. Most cable modem (DOCSIS) based ISPs provide a highly asymmetric DL/UL speed ratio where your 250Mbps down could be less than 20Mbps up. Often the upload speed goes up a paltry amount even when you pay for something closer to 1Gbps down with cable.
The brief period of time where I had fiber internet service (Sonic), the speeds were a symmetric 1Gbps. That could be 20x to 50x the upload speeds I get with cable.
If you are uploading content, doing backups to the cloud or other machines you own, or streaming video those upload speeds start to matter.