Re. the above:
The O.E.D. was started in 1857. Its first edition was completed in 1928. Its second edition was completed in 1989.
The O.E.D. only covers modern English. Its companion dictionary for Middle English was started in 1927 and is only now approaching publication of its first edition.
In terms of ongoing committment and multi-generational effort, these dictionaries are the modern day equivalents of mediaeval cathedral projects.
Not including words such as “it” or “the” would be no more than building a cathedral without foundation stones.