Hi,
It's true that WordPress has overtaken Joomla and that our extensions would have more exposure on WordPress.
However, as you mentioned, WordPress already has WooCommerce which is quite nice already.
Also, the biggest issue is that HikaShop has been made for Joomla. It can't easily be ported for WordPress.
Akeeba's developers have made a special abstraction layer between their extension and Joomla, years before they could then make them available for WordPress.
And even so, they have way less interfaces and integrations than HikaShop has with other things.
There is a good reason why no other Joomla ecommerce has ever been ported to WordPress: The amount of work is huge because of the amount of interfaces, plugins, modules, etc.