I’m not sure what you are asking. What type of playing do you do? What is your goal in playing?
Using music in orchestra, band, opera, etc. is one thing, but using music to play a wedding gig would be something quite else. I use it in the group things like orchestra, but not for wedding or reception repertoire…I play only from memory there. So, for me, it just depends on what kind of playing I’m doing.
Everyone is in a different situation and is doing different things. I see the people on this thread are interested in sight reading, but not everyone needs to sight read. Even in orchestra, I get my parts way ahead of time to prepare…either by buying them or printing them off IMSLP.