Although Google claims GA4 has improved capabilities in many aspects compared to Universal Analytics (UA), GA4 is really a disaster for users who need data analysis. Let me give a few examples: Previously on UA, my website's daily visitor data was almost updated in real-time. Now on GA4, I have to wait 1-2 days or even longer for the data to finish updating. With UA, I could easily analyze the details of each landing page data, and most of the time the data was accurate. But now on GA4, after I filter the data for multiple times, GA4 automatically adds a strange mechanism of data sampling, causing my data analysis to fall into a predicament. And so on, GA4 is so difficult to use. I really miss the good old UA, it was so great. In addition, now I use Looker Studio for data analysis, because I found the data pulled from GA4 into Looker Studio is more accurate and timely.