Why does this need to be installed here when previously agentless technologies was sufficient

As someone who works in offensive Cybersecurity doing Red Teamings, where most of my job is to bypass and evade such solutions, I can say that bypassing agent less technologies is so much easier than agented ones. While you can access most of the logs remotely, having an agent helps you extremely with catching 0-day malware, since you can scan memory (that one is a bitch to bypass and usually how we get caught), or hook syscalls which you can then correlate.

Oh, an unknown unsigned process just called RWX memory allocation, loaded a crypto binary, and spawned a thread in another process that's trying to execute it? Better scan that memory and see what it's up to. That is something you cannot do remotely.