Should WP_Query::get_posts be a private method?

[rebasaurus]

Sometimes, users call WP_Query::get_posts() incorrectly, as it is a publicly accessible method:

<?php
$args = [
// do args here
];
$my_query = new WP_Query( $args );
$my_posts = $my_query->get_posts();

Unfortunately, this ends up doing a double query to the DB, as the WP_Query::get_posts() is mistaken for a getter when used outside the scope of the constructor. The ideal way to efficiently query would be:

<?php
$args = [
// do args here
];
$my_query = new WP_Query( $args );
$my_posts = $my_query->posts;

...Or in the case where no arguments are directly passed into a new WP_Query:

<?php
$args = [
// do args here
];
$my_query = new WP_Query;
$my_posts = $my_query->query( $args );

I just want to preface that I actually don't have the historical context behind why WP_Query::get_posts() remains a public method (whether it's left for backwards-compatibility reasons or whatnot).

@jrf suggests a potential approach to this in ​https://github.com/WordPress/WordPress-Coding-Standards/issues/1860#issuecomment-768296206:

it may be more appropriate to see if this can be solved in WP Core by checking if the $query is the same as previously used and if so, short-circuiting the function to return the previously retrieved results as saved in the $posts property.

Would love to see some discussion around this if it can get resolved within WP Core.

Thanks!