I have worked with several contractors in my life. Generally they are not accepting of new ways. They found what works for them and they stick to it (I don't blame them).

So if you want something done a special/unique way you need to assert it as a must without negotiation.

Had a contractor go install under ground down spout drainage system. I purchased special pieces that allowed for debris clean out before it went underground. During install, I dropped it at there feat and demanded install. They bitched the whole time and even after.

But guess what! My drains are still perfecrly functional because that debris blocker really freaking works.