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I close the issue since I see disagreement on the feature request.
Modules/getpath.c and PC/getpathp.c use Lib/os.py to detect the stdlib directory.
_PyUnicode_InitEncodings() is the first function importing modules: to import the Python codec of the filesystem encoding. If this import fails, Python now dumps the "path configuration" to help users to debug their setup. See bpo-38236.
Example:
$ PYTHONHOME=/xxx ./python -c pass
Python path configuration:
 PYTHONHOME = '/xxx'
 PYTHONPATH = (not set)
 program name = './python'
 isolated = 0
 environment = 1
 user site = 1
 import site = 1
 sys._base_executable = '/home/vstinner/python/master/python'
 sys.base_prefix = '/xxx'
 sys.base_exec_prefix = '/xxx'
 sys.executable = '/home/vstinner/python/master/python'
 sys.prefix = '/xxx'
 sys.exec_prefix = '/xxx'
 sys.path = [
 '/xxx/lib/python39.zip',
 '/xxx/lib/python3.9',
 '/xxx/lib/python3.9/lib-dynload',
 ]
Fatal Python error: init_fs_encoding: failed to get the Python codec of the filesystem encoding
Python runtime state: core initialized
ModuleNotFoundError: No module named 'encodings'
Current thread 0x00007f845ca19740 (most recent call first):
<no Python frame>