8GB is low for a dev machine nowadays. Your browser uses 1/2GB, IDE using 1/2GB+ (JetBrains Rider often uses like 4GB for me), then the OS itself, database servers, virtualization overhead (e.g. Docker) and other tools. Easily used up.

16GB is the bare minimum for a dev machine in 2021 IMO. Anything higher than that is 'nice to have' unless you're doing heavy stuff like data analysis, machine learning/AI, games development etc.