Can modern mankind do without biotechnology?

Biotechnology is the use of living organisms in production. Biotechnology is the use of living organisms to solve technological problems. The use of bacteria for fermentation, the production of medicines from plants, breeding and much more was used in antiquity, even without understanding the essence of the processes themselves. So the rejection of biotechnology in this sense is theoretically possible. But do we need such a world, without good varieties of plants, sugar (and where else to get it), medicines, dairy products and much more.
But if you invest in the concept of biotechnology only modern types of biotechnology, such as: bioengineering, bioinformatics, bionics, etc. Then the question is not so radical. Biotechnology will solve the problems facing a person of the 21st century. With CRISPR / Cas9, we may be able to treat inherited diseases in the future. Genetically engineered organisms will help solve the problems of lack of fresh water and global hunger. Bacteria can solve pollution problems, and they also efficiently produce various substances (Insulin for diabetics produces E. Coli).
We, quite, can afford to give up all this and do not die out. Mortality will simply be higher, and the global problems of all mankind will begin to worsen even more.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.