One of the checkride items is crew coordination and you don't get that experience single pilot.
There are two type ratings for most two pilot type rated aircraft first is a SIC type rating that requires training and signoff and 8710 with the FAA, easy and makes you legal as a SIC. Moving up to PIC is the serious checkride, equipment oral is hard if you don't know the aircraft and precise flying later. It is a test and you should feel tested.
Most companies will appreciate your experience, but you still have to fit in, get along with others, get some experience with the aircraft and company SOP. It all rolls together to get a recommendation for PIC