Hello,
I will see to update the blog article since the feedback we got during the past two weeks are good.
Because there is a major modification in the structure of the order/transactions ; I preferred to add that message so users won't update a production website like that ; we had experience with HikaShop 3.0 release where production website has been update without proper tests and a lot of design/css broke.
In any case it's still best to perform test in a preproduction website when performing major updates of components (and depending the component, even minor releases).
Regarding HikaMarket 2.0, since the product edition page has been fully re-design, the view of HikaMarket 1.7.3 is very different.
For what I remember regarding the modification ; it was mostly because of the variable "price_value" which still contain the price without the tax so when in "floating tax" mode, it needs to use the "price_value_with_tax" one.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.