ZFs have been used in people a long time creating a strong safety record...
New improvements in accelerating development of ZFs have minimized any advantage CRISPRS may have in research time.
Their advantage is the relative complexity of ZFs which I can imagine require more experienced... costly... personal that may be in short demand.
If research creates targets using CRISPERS it may very well be more economical for product oriented companies to at that point switch to ZFs ... esp with its new and advancing delivery systems... to ensure most rapid approval.
We know ZFs work... I love the repeated use of the word by several KOLs... "exqusite" control ... The issue for all such work is, are the target/s correct and is the subsequent engineering well thought out and correct. And again in regard to MPS 1 and 2, its so simple its simply super.