Survey response likelihood is less about attention span and more about "value". What value are the respondents providing compared to the potential value they'll get back. This "calculation" includes their time to complete, usefulness of the information, sensitivity of the information, etc. If the value ratio isn't tipped in the respondent's favor, you are way less likely to have a strong response rate. Similarly how intimate the questions are (are you asking very personal things or not) will be added to their calculation and may be a factor if their anonymity/confidentiality is in question.
Your question about "do they really get shots off quicker" is answered (somewhat) on a linked page to the Tennis Warehouse page already linked. According to the research they did, the Vapor 1X had the quickest release of the sticks they tested (20.7 ms). Worst is True A6.0 SBP at (23.3 ms). We are talking less than 3 millisecond difference between the best and worst sticks on their list. The mean/average of all the sticks tested is 22.4 ms. That gives us a standard deviation of less than 1 for all the data points provided, which would not be scientifically significant. So, is there a difference... yes. Is it one that scientifically makes a difference...no. According to Wikipedia's page on milliseconds, a horsefly's wing flap is 3 milliseconds. If a human can pick out 1 wing flap of a horsefly, I'd be amazed. So.. maybe they are "hype".
So if we take the science off the table as being significant, it comes down to feel/proprioception. Stiffer blade feel vs. softer blade feel. Where the stick flexes compared to where your hands naturally fall on the shaft to give the sensation of flex back to your body. Etc.