For those that use Obsidian for Product management...a question

Hey folks. I was curious about folks who us Obsidian for product management, specifically focused around customer engagement notes. I started to test out Obsidian late and I see a lot of potential as I wrap my brain around Obsidian.

I started to build some templates and can see immense value.
One thing I do with OneNote (migrating away from) is to have a “running” list of notes from multiple customer engagements, for each customer. I usually just add the date in a section and it is all in one big onenote.
Is there a better approach perhaps with Obsidian? Is one big note better, or break them into multiple notes and use tags to find?

It very well could be a personal choice matter. What I am looking for is a way to capture everything and make it easy to find.
I still have much to learn, but that is part of the enjoyment.
I appreciate the feedback very much!