[version 1.0? - develop] Is Navigation caching broken?

[Zerowalker]

Municipio/library/Helper/Navigation.php

Line 169 in d7824f1

$menu = wp_cache_get($transientHash, 'municipioMenuCache' . $transientType);

From my understanding the point here is to cache the results for X amount of time and reuse it till that time (or when it's cleared manually).
(Also, why is this only implemented for MobileMenuAuto and no other menu?)

But when testing as far as i can tell it's not really used except if it's multiple calls during the same session i believe.
And in that case it's far less useful that it should be right?

I'm not that familiar with how WordPress caching works, but I think WP Object Cache isn't persistent anymore, but perhaps it was when this was implemented?

https://developer.wordpress.org/reference/classes/wp_object_cache/
looking there it says:

Prior to [WordPress 2.5](https://wordpress.org/support/wordpress-version/version-2-5/), data stored using the wp_cache functions was stored persistently if you added define('WP_CACHE', true) to your wp-config.php file.

This is no longer the case, and adding the define will have no effect unless you install a persistent cache plugin (see list below).

Any having one of those plugins might not always be the case.
So i'm wondering if it might be a better idea to utilise Transient API instead: https://developer.wordpress.org/apis/handbook/transients/

This isn't a complaint and I might very well be completely wrong, It's just meant as a feedback/question.
So i would love to hear your thoughts on this as I will surely learn a thing or two:)