Analytics are primarily used for recording data so you can analyse trends and statistics in your game.
I think that analytics are most important if you’re working on a game at scale and want to tackle features based on how players are interacting with your game. For example, analytics may help you determine if a progression system is too grindy or difficult to go through. You might then use this data to release tips and tricks to level up better, or ease the requirements to progress in a future update.
They aren’t all important, especially for the Roblox environment. Think of them as just an extra tool to help you assess player interaction with your game: not a necessity, but definitely helpful, especially for those who love working with data or using statistics to formulate a game plan for future updates.
The Wikipedia article on analytics itself is a pretty good entry point for talking about the use of analytics and some of the points may be applicable to you: