A topic it’s like a conversation, a no computer generated summary are going to tell you about what is going on in a conversation you arrived late.
If you pick some posts from the conversation you are getting just fragments that may not mean nothing.
You could ask the OP or any active user in the topic to write a short summary about what is going on every 50 posts. I know that very few people will take the time to do it, but if someone care about the topic, he/she could make it approachable for future generations.
If not, well, the topic will end in the aether like all the other conversations we have every day.