> observing it will drastically impact the event

this presumes 'metrics' are 'cheaper' than 'traces' / observability 2.0 from a setup standpoint; purely from an implementation perspective?

Wide events seems like it would require more memory and CPU to combine and more bandwidth due to size.

I've implemented services with loggers that gather data and statistics and write out just one combined log line at the end. It's certainly more economical in regard to dev time, not sure how "one large" compares to "many small" in reality resource-wise.