With both the price and efficiency of chemical products declining, why don’t ethylene plants adjust their raw material mix? ?

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Currently, the overall prices and profits of chemical products are declining; in some cases, the internal cost calculations show huge losses in the processing of ethylene and propylene. Why then, in a market environment where oil products such as gasoline, kerosene, diesel, MTBE, and alkylated oils are performing well, do manufacturers not adjust flexibly the feedstock composition of their ethylene cracking units by increasing the proportion of light hydrocarbons such as ethane, propane, and butane? This would allow for the production of lighter naphtha, kerosene, hydrogenated tail oil, diesel, and other types of oil that can be used to enhance the output of refined products, or it could enable the use of catalytic cracking feedstocks to increase the production of olefin-rich liquefied gas, thereby boosting the production of MTBE, alkylated oils, and catalytic gasoline Why, in the face of a bottleneck in subsequent gas-phase processing in ethylene cracking, is no structural adjustment made to increase the processing of light hydrocarbons by reducing the amount of distillate oil processed? Why persist in pursuing a large total volume of ethylene production, rather than shifting focus to the benefits of processing lighter hydrocarbons such as ethane? Why adopt a production model that involves using excess ethane and liquefied gas as fuel, or exporting low-cost liquefied gas? In my opinion, given the current exceptional opportunities in the oil market, especially the favorable export conditions, the approach of \"using olefins when appropriate\" should be adjusted to \"using both olefins and oils, and accelerating (chemical) processing when necessary.\" In the face of difficulties in the operations of petrochemical companies, a strategic approach that involves adapting to changing circumstances and times is the true \"key to success\" and the \"lifeblood\" of such enterprises!