In our county I helped move 2 districts to Google devices only and within a year they moved right back to laptops for the teachers. Most of the other parts of the infrastructure stayed Google devices however. Some reasons:
1) the teacher devices had low amounts of RAM/processing power. To me teacher chromebooks didnt really start to shine until the last year or so. Even so, the cost of the teacher chromebooks was so close to a Windows laptop that the district decided to move back to the laptops.
2) Several departments needed Graphics cards. Some departments needed specialized devices (like our drone program).
3) Even though Office 365 existed, people could not grok using it over an installed Office program.
4) There were some printer issues although they were miniscule.
5) Admin continued to use laptops, especially the business office. Once that was noticed, and the price difference was less noticeable, teachers started negotiating for laptops.
6) our subs used chromebooks that were set up with a sub login, access to the specific sub plan drives and SIS pages, These devices came from the front office with a YubiKey for login. They were turned in at the end of day. These devices work well and existed past the return to teacher laptops.
7) While casting seemed to be a major concern, it turned out to not be a problem. Making sure you have a stable secure building wifi seems to eliminate everything except the typical issues like students being left alone in a room, reseting the chrome casting device or IFP and casting to it. The largest issue we had to overcome was the amount of updates to the device, then to the casting software, then the device, then the software... It seemed like every week the two would send out a update and break connection until the update was run.
😎 The users who use chromebooks use a nice cheap usb C dongle with 3 outputs that go to their monitors. We havent had many issues with this besides "unplug it and plug it back in. Now go to display and select _______"