What difficulties do middle wordpress developers face?

Question

WordPress

I’ve been working with WP for about a year, but by and large, acf didn’t leave anymore, I had to write more on the same WP sites in jquery, calculators, scrolls, etc.
Those who know WP at a fairly good level, what do you encounter in everyday work ?
action hooks and filters, acf this is usually enough. Since this is cms, there are many plugins for it and writing what already exists does not make much sense in practice. Was there such a thing that there are no plugins and you had to write it yourself? WP has database work, but even in my corporate sites of 10 pages or more, I had to go that far. So what sites on WP require serious knowledge of it?
Maybe you have examples of your sites and you could describe that some particular block that you did manually and did not find a ready-made solution on WP.
Interested in specific examples.
This question is for wordpress developer.

Answer 1

Was there such a thing that there are no plugins and you had to write it yourself?

Constantly, the plugins are all very general or just some kind of crap. They are missing, in short.

Answer 2

For example, now I am importing goods (25,000 items) into woocommerce. It is necessary to make sure that the server does not lie down (we have 500 MB of RAM and "half the core" on the VPS) and everything is done quickly, since there will be 2 files of 25,000 positions, one of them needs to be parsed once a day, the second time per hour and that's it by crown. Not only are there no plugins here, but I also had to abandon all VP functions except wpdb and set define( 'WP_USE_THEMES', false ), define( 'SHORTINIT', true ).
The second example is using preact in the admin panel :)
Well, this is what comes to mind now, but in general we constantly make non-standard solutions without plugins, only acf and cpt ui

Answer 3

I have never encountered writing a plugin myself, or if you search for it, or if not, then this is such a specific task that it is written in function.php and a separate plugin is not created.