The specifications for both the 2U home server and the general-use PC at home seem to be well thought out and should perform well for their intended purposes. However, there are a few points that could be improved or considered for better performance and longevity.

2U Home Server

CPU Cooler: The Noctua NH-L9a-AM4 Low-Profile Quiet Cooler is a high-quality cooler, but you might want to consider the NH-U14S or NH-D15 for better cooling performance, especially if you plan to overclock your CPU.

RAM: 32GB is more than enough for most server tasks, but if you plan to run heavy virtualization tasks or use Docker, you might want to consider 64GB or even 128GB.

Storage: The build doesn’t include any storage devices. Depending on your needs, you might want to add some SSDs for faster data access, or HDDs for more storage space.

General-use PC

CPU: The Intel Core i3-12100 is a good CPU for general use, but if you plan to do heavy multitasking, gaming, or video editing, you might want to consider a more powerful CPU like the i5 or i7 series.

RAM: 32GB is a good amount of RAM for general use, but if you plan to do heavy multitasking or use memory-intensive applications, you might want to consider 64GB or even 128GB.

Storage: The build doesn’t include any storage devices. Depending on your needs, you might want to add some SSDs for faster data access, or HDDs for more storage space.

CPU Cooler: The Noctua NH-L9i-17xx Low-Profile CPU Cooler LGA1700 (Brown) is a good cooler, but you might want to consider the NH-U14S or NH-D15 for better cooling performance, especially if you plan to overclock your CPU.

In conclusion, while the current build specifications are solid, you might want to consider the above points to better suit your specific needs and improve performance and longevity.