Database Optimization Issue

I noticed that woocommerce despite the latest releases to optimize the database structure still has many structural optimization issues.

If you try to create a simple post-product with only the title and the price (custom field) woocommerce will create in the post_meta table as many as 32 row that for the most part will be empty.

This makes the database very huge when there are a large number of products.

Example: when creating a virtual product, woocommerce creates 4 custom fields that are very useless _weight, _length, _width, _height as a virtual product has no size and weight.

Many other custom field are obsolete like the ones just mentioned, would not it be better to write on the database only the fields that have a value ? why are fields written that have nothing inside, making the database slow ?

moreover, many of the fields that are written could be enclosed in an array and saved in a single custom field, because what is not done ?

Have you already encountered this problem ? exist a solution ?

this is the row that woocommerce create without never value inside, when create a simple product, so they are not necessary:

_wc_review_count 
_wc_rating_count 
_wc_average_rating 
_edit_lock 
_edit_last 
_sku 
_regular_price 
_sale_price 
_sale_price_dates_from 
_sale_price_dates_to 
total_sales 
_tax_status 
_tax_class 
_manage_stock 
_backorders 
_sold_individually 
_weight 
_length 
_width 
_height 
_upsell_ids 
_crosssell_ids 
_purchase_note 
_default_attributes 
_virtual 
_downloadable 
_product_image_gallery 
_download_limit 
_download_expiry 
_stock 
_stock_status 
_product_version

I also opened in the “ideas” section of
woocommerce this request:
http://ideas.woocommerce.com/forums/133476-woocommerce/suggestions/34144924-database-optmization

If you think it’s a real problem, put +1