What does “good long-term memory” actually mean in AI roleplay/chatbots?

I’ve seen a lot of people mention that “long-term memory” is one of the most important features in AI roleplay or chatbot experiences, but I feel like it can mean very different things depending on the person.

So I’m curious from a user perspective – what does “good” long-term memory actually look like for you?

Some things I’m wondering about:

• Do you expect the AI to remember everything, or just the important parts?
• What counts as “important” (relationships, personality, past events, preferences, etc.)?
• After how many turns should it still remember things? 50? 100? Unlimited?
• Is it better for memory to be selective and consistent, or detailed but sometimes messy?
• What kind of memory mistakes break immersion the most for you?

Also, if you’ve ever used a bot that felt like it had genuinely good memory, what did it do differently?

I’m trying to understand this more from actual user experience rather than just a technical definition.