I think you may want to rephrase "the more reliable software can be achieved", I find the meaning a bit confusing and it's used both here and in the next bullet?

Rephrased a bit. My main point is: the more similar two environments are, the less likely there will be issues due to those environmental differences. Hence its more reliable. Rephrased to more directly say it's about environment-specific differences.

It'd be nice to hear more about why and how a relative path makes the virtual environment more portable. A Python installation will still need to exist in a specific location on the new host, right? Is the pitch for a relative path that you'd copy a virtual environment and the Python installation together?

Yep, that's the use case, although even the "copying" may be virtual - while an app embedding a single Python runtime and basing multiple virtual environments on it getting installed to different locations is one possibility, other potential scenarios would be a mounted parent folder in a container, or a mounted network drive on a host.

The key is that the position of the venv and its base runtime relative to each other is consistent, but the path prefix leading to their common parent folder may vary across systems.

I added a sentence to help answer this question. PTAL. Or were you thinking more like a dedicated section?

Rephrased a bit. My main point is: the more similar two environments are, the less likely there will be issues due to those environmental differences. Hence its more reliable. Rephrased to more directly say it's about environment-specific differences.

I added a sentence to help answer this question. PTAL. Or were you thinking more like a dedicated section?

When I read this, it's not clear to me what exactly is being proposed here, it makes it seem like this is better suited for a doc.

This sentence is grammatically incorrect, and this is the only usage of the acronym which is also not explained. I suggest it is just replace with the full spelling, and corrected: "Because the current working directory isn't ..."

I think the title of the PEP could be clearer. At the very least I think there ought be an article or preposition between the words.

Potentially clearer?

This is the date a sponsor was secured, hence formally the date of number assignment

A PEP describes a change. This paragraph does not state what changes are being proposed compared to the status quo. Perhaps:

It can also be a useful thing to start sentences on new lines, to reduce future diff sizes.

Where? Please provide a cross-reference to the Python documentation or packaging standards

It's not documented anywhere, it just doesn't work if you try to do it. I guess we could link to the bug report that precipitated the PEP: python/cpython#135773

Maybe a link to the source on gh?

This sentence doesn't add much. It's also somewhat confused by the next para which says that the reason they are wanted is because they're prohibited.

I would first (briefly) explain to the reader what the home field in pyvenv.cfg is for, then go on to discuss the benefits of relative paths. Assume the reader is technically competent, but doesn't have all the context you do of the history here.

or

This should be a sub-section within Specification

Erroneous whitespace