Yes, he said. But there is also such term as "ends and means". If I don't want to buy one more lumbersome and power-greedy device (aka NAS), then using router for putting backups and watching movies from SSD is an
acceptable means to an end.
Just out of curiosity I checked the indicators of my current laptop SSD.
2% endurance indicator and 77% of Wear Leveling Count (WLC), and that after 3 years of intensive use. That is laptop (!) where reads/writes are
much more frequent than will ever be on router ( i.e. backup) SSD.
I believe I can live with that, and even with lesser numbers