Is /usr/obj Required For Installation?

From: Tim Daneliuk <thronobulax_at_gmail.com>
Date: Tue, 03 Dec 2024 13:16:59 UTC 
After running buildworld and buildkern, is /usr/obj subsequently required
to install the new kernel(s) and world files or are all the required object
files already bound into installable libraries?

I have FreeBSD running on a very small footprint VM and would like to free
up disk space right after the builds, even though I will not immediately
install them.

TIA