Firstly, I would like to express my gratitude to the development team for their willingness to waste time reviewing my suggestions
The suggestions I can think of for pipeline upgrade are as follows：

1.The pipeline protected by scaffolding is modified into complete blocks, so that some special blocks (such as redstone powder, 1.14 original bamboo scaffolding, etc.) can be placed above it

2.Add a pipeline valve that can be controlled by a redstone signal switch. Some factories that rely on pipelines may need this

3.Can set the input and output priority of pipelines
The example is as follows: When I was developing a large refinery using the integrated mod "Immersive Petroleum", the production of gasoline always produced excess naphtha. If no priority was set, this could result in naphtha sometimes being input into the refinery to make gasoline, and sometimes being directly burned into the chimney, causing serious impacts on gasoline production. However, after setting the "input&output priority", naphtha could always be prioritized for input into the refinery, and the excess naphtha could be input into the chimney for burning

What version of IE are you using?

The Pipe Valve was added in IE 11.4.2 for 1.20.4. If you are using a version for MC 1.19.2 or earlier, you may be able to use wilechaote's version in the Engineer's Decor mod: https://www.curseforge.com/minecraft/mc-mods/engineers-decor.

Note to devs: The described behavior of scaffolding-covered pipes (in 1) persists into current version of IE (11.6.1-181)

What version of IE are you using?

The Pipe Valve was added in IE 11.4.2 for 1.20.4. If you are using a version for MC 1.19.2 or earlier, you may be able to use wilechaote's version in the Engineer's Decor mod: https://www.curseforge.com/minecraft/mc-mods/engineers-decor.

Note to devs: The described behavior of scaffolding-covered pipes (in 1) persists into current version of IE (11.6.1-181)

To the production team: Hello, the "IE" version I am currently using is 1.19.2-9.2.4-170. You replied to my first question and found that the mod version you mentioned is in version 1.20.04 of the game. Unfortunately, this did not solve the problem, but the error is not with you. The second question I asked gave me a very practical answer, and I am grateful that it will enhance our gaming experience. I will try my best to contact the Chinese encyclopedia editing team to input the linkage mod you quoted. What is your opinion on the third question? If adopted, it would be an exaggeration to say that this feature would be a revolutionary game change!

The pipes don't have priority because setting 'priority' on flow doesn't make much sense. The problem you had is mostly a problem with IP's fluid demands and not IE's, but since I designed IP's production chains I will answer it here:

The intended method is not priority, it is to have a control system if you don't want to design perfect ratios. For instance, if the tank is >90% full, dump to a flarestack, otherwise don't dump it. Setting priority would turn the control challenge into something that's just set a number in a pipe and be done with it.