Reportedly, Sony has taken this step to boost the production of PS5 to meet the increasing demand for the newly-released models worldwide.
Microsoft Halting Production Of Xbox One X And All-Digital Xbox One S - Game Informer
Sony Discontinued PS4 Pro Production in Japan Amidst Skyrocketing Demand for PS5
Sony Launching Glacier White PS4 Pro This Month
Sony Japan officially discontinues all PS4 models except the 500GB slim
Sony might be killing the PS4 Pro to make more PS5 consoles
New Sony PlayStation handheld reportedly in development with possible PS4 backward compatibility and potential PS6-generation launch - News
Sony Japan confirms PS4 Pro and 'all but one' PS4 model have been discontinued
Sony is officially discontinuing most PS4 models — what you need to know
Sony Confirms PS4 Pro Has Been Discontinued In Japan
Sony will continue making PS4 consoles throughout 2022 due to PS5 shortages
Japanese Retailer Discounts PS4 Models Said to be Discontinued
Sony's PS4 details: cheaper than Xbox One, allows used games and offline mode
PS4 Pro No Longer Being Sold By PlayStation Direct, Prompting Rumors It Will Be Discontinued - PlayStation Universe
Sony Launches More PS4s to Combat PS5 Shortage