Why does Spring Authorization Server use Base64StringKeyGenerator for generating tokens?

Question

I am currently working with Spring Authorization Server and noticed that it uses Base64StringKeyGenerator for generating tokens. However, I'm unsure about the reasoning behind this choice and whether it's expected for the generated tokens to appear as seemingly random strings without any useful information.

1. Why does Spring Authorization Server use Base64StringKeyGenerator for token generation? Are there specific advantages or considerations for this choice?
2. When inspecting the generated tokens, I noticed that they appear as random strings (e.g., 28VO6BUTCOPRTEmH5odQwuNSODE_T7e2nTvkiAZ0R3rTYwO0UmIE0_de9EeciUvDJFhpVtgd6KPIpavVhWJ7xTMSX2J1sIU8_ZfxaaH763S4DFHO8OFnmcygT8sLlBBQ) without any discernible information. Is this behavior expected?
3. Should I expect the tokens generated by Spring Authorization Server to contain meaningful information, or is their purpose primarily for secure identification and validation?