We decided against it, and if needed will use the iPhones as a hot spot. I am not a fan of ATT. We had ATT before dropping it for Verizon due to ATT coverage and dropped call issues, and then moved to T-Mobile due to T-Mobile's unlimited everything plans that covered Canada. We vacation in Canada, and Verizon charged $25 in month-only increments for our single week in Canada and we ran out of data in 4 days, mainly due to navigation, email and weather apps.
That said, to make the best decision, one needs to actually know what their potential data consumption is. An iPhone or iPad will tell you that app by app. Siri (and voice transcription) is a data pig for me. I have found that using my ISP and router data tools that on my non-phone wired and wireless devices they vary widely for identical tasks. The iPad is thirsty, the WIndows laptop is next and then the WIndows desktop, with the Linux laptops and desktops being the most frugal by far.
Apart from deliberate downloads or streaming, I have found the largest amount of data use is the non-deliberate data use, such as background services, voice recognition, and constant pings and checks for analytics, updated info and software, as well as ads when browsing. I have extremely effective adblockers on the non-Apple products and that alone makes a big difference in consumption. Knowing your data consumption allows one to decide which data level of the plan would be best.
If other carriers (T-Mobile) could be used by SIMS as referenced above, or If I had children, I might consider a hotpoint, but I would then I would risk being visited by the ghost of my parents who would probably say, "Don't make me stop this car." That was their reaction to sibling taunts and boredom on long drives. I have to admit it worked for us.
