A food industry project is a massive undertaking irrespective of its scale or cost. It requires Engineering expertise from many domains, e.g. Process, Civil, Mechanical, Electrical, Automation, Quality, Safety, and others.
No matter how good, one person cannot be a know-it-all or do-it-all. It is simply not possible, considering typical project timelines.
To overcome this, an experienced consultant or engineer may outsource the various works to other agencies or experts. Essentially, we have ended up working in silos, and the quality of work is severely impacted, as none of the outsourced partners really care about stuff outside their scope. A sub-vendor will never care about the original customer. And the consultant can never go into details because he is actually doing the work.
Hence, if you want to do good work, you must engage a team that has all the competencies in-house with related experience to firstly qualify to take end-to-end responsibility and secondly deliver the project goals.
Time is money. A good engineering team will save you massive amounts of time by knowing what they are doing, doing it the first time right, and taking responsibility.