Same is true for software "engineers". We don't take a professional exam or adhere to any professional licensing. We aren't legally engineers in some states/nations.
Licensed engineers are a subset, in a mathematical way. All licensed engineers are engineers, not all engineers are licensed engineers.The licencing of some engineering is simply a relatively recent regulatory capture but that does not limit the types of work that engineering covers.<a href="https://www.etymonline.com/word/engineer" rel="nofollow">https://www.etymonline.com/word/engineer<a href="https://en.wiktionary.org/wiki/engineer" rel="nofollow">https://en.wiktionary.org/wiki/engineer
chiffre01 · · focus · HN ↗
alistairSH · · focus · HN ↗
jfoks · · focus · HN ↗
The licencing of some engineering is simply a relatively recent regulatory capture but that does not limit the types of work that engineering covers.
<a href="https://www.etymonline.com/word/engineer" rel="nofollow">https://www.etymonline.com/word/engineer
<a href="https://en.wiktionary.org/wiki/engineer" rel="nofollow">https://en.wiktionary.org/wiki/engineer