Unnecessary product postmeta

Hi,

By default, adding a product will store a bunch of lines in postmeta.

Depending on what the e-commerce website is about and on what you are selling, a lot of the meta has absolutely no use.

In my particular case, (at least) the stuff below is totally useless:

'_tax_status',
'_tax_class',
'_weight',
'_length',
'_width',
'_height',
'_upsell_ids',
'_crosssell_ids',
'_purchase_note',
'_virtual',
'_downloadable',
'_download_expiry',
'_wc_rating_count',
'_wc_average_rating',
'_wc_review_count',

As you can see, there are A LOT of rows in wp_postmeta table that are not needed, inserted with each new product.

So basically I have 2 questions:

1) Why can’t you improve this? For instance, most of the meta keys should be saved in db ONLY if there is a value inserted (like weight, height, etc.).

2) Why is _tax_class considered a must? Maybe this way I could better understand the bigger picture (if there is any).

Here’s the corresponding function in WC’s file:

/**
* Meta data which should exist in the DB, even if empty.
*
* @since 3.6.0
*
* @var array
*/
protected $must_exist_meta_keys = array(
	'_tax_class',
);

Throughout the years, you’ve received similar complaints from people with very large postmeta tables. I’ve read a lot of discussions on github and you somehow acknowledge this matter, yet you haven’t done anything about it.

Is there a logical explanation for this?

Thank you.