I'm very grateful to be able to use it, and I have a master's degree with a focus in Geospatial Analysis. There can be a bit of a learning curve, and I try to build user-friendly ways for volunteers to see & collect data. Meanwhile, if a colleague is less confident with building such a system, it may be more difficult for them to implement.
Geosite can be used brilliantly if you have the final format ready as per your need, it can aggregate, clean, compile & summarize data as per your liking & recommendations & can even help in simplifying the summary as per the understanding levels of target audience, however if you do not have a specific format for summaries in mind, it can struggle to make sense of raw data & present it appealingly in a visual format which can be easier to go through rather than just a large set of numbers.
Simply because the program deserves it. It seems to me that it is a fundamental tool for the storage, analysis, and interpretation of medium and large-scale phenomena, unmanageable with traditional engineering software. Its versatility in the handling of the different "layers" with which the data is handled and interpolation tools, make this software a powerful ally both for companies and for the educational part of the universities.
Once set up, the tools are extremely easy to use. I had a staff member develop a tool for field data collection, that included an external and internal dashboards to monitor progress in days. The field workers that collected the data, barely knew how to use a computer, and within minutes they could use the application that was configured for them.
ArcGIS' web support is quite good. They also have a broad user base that is active in answering community members' questions. For more sophisticated questions, ArcGIS technical support is good at answering questions, although answers usually are not instantaneously available. I'd also say that ArcGIS is working hard at making its technical support more reachable, at least it appears that way.
My students love the "drop" feature in Google Maps, but besides that it truly doesn't compare. I love that you can add, delete, or change layers to this map to better understand its larger affect. There are many more ways to manipulate maps on ArcGIS than on Google Maps. I can also add personal details and information if I want to create a specific map, something that I am unable to do with Google