To me yes. Previously, people didn’t have any problem in remembering the telephone numbers and other tasks to do; Whereas it is not the same case now.
The so called useful tools including social networking apps, fully functional web surfing, games and many others mindlessly occupy time of people. Instead of doing productive work, people keep on wasting their precious time.
Not really dumb per se but it made out lives so convenient we became too dependent to it. Plus, there are just too many to remember these days. Say the sample regarding phone numbers, it is difficult to do that these days because there is no 1:1 ratio between a person and a number. I know of people who keep 2-3 mobile phones at a time!