Mojolicious::Lite is absolutely superb for rapidly developing single-file CGI scripts / persistent webapps with embedded templates. With no CPAN dependencies it should definitely be a Perl core module, for the same reason CGI was core for 18 years. Web is still the killer app!

"With no CPAN dependencies it should definitely be a Perl core module"

The releases are frequent, probably best just to install the latest release rather than bundle as part of the core IMHO.

probably best just to install the latest release rather than bundle as part of the core

18 years of core CGI, the success of The Python Standard Library, and the failure of Perl to maintain relevance (let alone its former dominance) indicates that you are catastrophically wrong.

Structured Markup Processing Tools

    html — HyperText Markup Language support
    html.parser — Simple HTML and XHTML parser
    html.entities — Definitions of HTML general entities
    XML Processing Modules
    xml.etree.ElementTree — The ElementTree XML API
    xml.dom — The Document Object Model API
    xml.dom.minidom — Minimal DOM implementation
    xml.dom.pulldom — Support for building partial DOM trees
    xml.sax — Support for SAX2 parsers
    xml.sax.handler — Base classes for SAX handlers
    xml.sax.saxutils — SAX Utilities
    xml.sax.xmlreader — Interface for XML parsers
    xml.parsers.expat — Fast XML parsing using Expat

Internet Protocols and Support

    webbrowser — Convenient web-browser controller
    wsgiref — WSGI Utilities and Reference Implementation
    urllib — URL handling modules
    urllib.request — Extensible library for opening URLs
    urllib.response — Response classes used by urllib
    urllib.parse — Parse URLs into components
    urllib.error — Exception classes raised by urllib.request
    urllib.robotparser — Parser for robots.txt
    http — HTTP modules
    http.client — HTTP protocol client
    ftplib — FTP protocol client
    poplib — POP3 protocol client
    imaplib — IMAP4 protocol client
    smtplib — SMTP protocol client
    uuid — UUID objects according to RFC 4122
    socketserver — A framework for network servers
    http.server — HTTP servers
    http.cookies — HTTP state management
    http.cookiejar — Cookie handling for HTTP clients
    xmlrpc — XMLRPC server and client modules
    xmlrpc.client — XML-RPC client access
    xmlrpc.server — Basic XML-RPC servers
    ipaddress — IPv4/IPv6 manipulation library