A lot of those "environmental" initiatives are also down to cost too,ie,fear of being persued under various legislations passed in many parts of the world,or have people forgotten one of the reasons Trump is trying to make cuts to the EPA in the US,and reduce regulations,etc(even if the environment is affected) since business in the US have complained about "costs" in regards to this?? OTH,in some parts of the world,you might even get tax breaks too,if you try and be more environmentally friendly,etc(IIRC).
Also another thing,Intel couldn't give a monkeys about hardware enthusiasts on forums in the larger scheme of things,since the vast majority of their own users won't ever overclock,and they need to only make sure their CPUs work fine for the duration of the given warranty. Intel won't care how hot a CPU runs as long or whether longterm it causes more issues,since its out of their remit outside the warranty period,and AMD has done the same for some of its own products too.
The fact that they can only need to use one supply line and one class of interface material will also simplify their supply lines anyway. Think about having to have separate lines to solder certain CPUs,storing the materials,etc?? Far simpler and cheaper to just stick to one method,and the added benefit is if they can bulk order the materials in larger quantities they can drive the price down. Plus unless Intel is devloping the TIM in-house they are more likely will be contracting companies to do so and can pit them against each other to drive costs down. I expect companies making the interface materials using rarer metals will be far lower in nature due to the costs involved in working with such materials.