You are out of your mind
What is that set?
Would you advise that car dealerships buy ÂŁ10 diagnostic scanners from ebay, rather than use thousands of pounds worth of manufacturer's equipment?
Should those car dealerships provide cheap jacks and axle stands for their mechanics, rather than expensive ramps?
Would you advise a chef to ditch their expensive knives, because they could buy knives from a pound shop?
With respect, there are tools and there are tools. I'm not an electrician, so wont tell electricians what tools they should or should not use, but any one who uses a tool regularly will know what is up to a particular job and what is not.
I have a variety of tools. Some were cheap and some were not. Some of those cheap tools are junk and some are reasonably decent. If I need a tool for a one off job, I may well go for the cheapest option that is fit for the purpose for which I need it. If I'm buying a tool that's going to be used regularly, chances are I'll buy something that will do the job and also last a significant period of time.
In your shoes, I wouldn't try arguing against years of combined knowledge about a task you've never completed successfully. Maybe when you've managed several thousand secure crimps, using a €5 tool, you might be in a better position to denounce more expensive options. Until then, I'm inclined to agree with those voices of experience.