This only applies to those who have AvPD as their core/primary PD.

A job depends on many things such as your capabilities, right place at the right time, peer pressure, need the job, an interest, the job came your way etc.
Socializing depends on the environment- which also includes how we feel and treated amongst other staff members.
a) We're not going to be social butterflies but in some cases we need to appear social in order to hide our AvPD . Adapting to what's needed. There can be members of the staff that we like to be around. They might feed a deficiency that we need-admire in them etc. *adapting is all very modified to our capabilities.
b) Situations can also lean to that we just have a role to fulfil, without any real need of communication/social interaction. We can just focus on the task at hand- however that usually sends us deeper into ourselves-not really a good thing.

Kinda need a. & b. as healthy balance of ourselves and others... but that will always be short lived or needs some kind of timed out interval to prolong the tide.

The incoming tide is AvPD, it's anxiety, self doubt, putting others forward, feeling insecure and seeing others more worthy. This usually over time this catches us up where we start to become unsettled, till eventually we need to either leave and find something new, leave and continue that same kind of job at another place of employment or basically get out and away to find and start something new.

We can work a job that fits what we need at that time and we can perform those duties for some time (struggling through the social stuff ) but that tide eventually catches up on us. That incoming tide can take a long time before it reaches us because that saying "the devil you know" kinda rings true plus every avie wants to prove themselves so they will work under their self inflicted pressure for a very long time before they can't maintain the mental power to stick it out anymore.
There is no one clear answer for the social stuff as there is millions of reactions and changes depending on the situation...plus, its normal for us to move the goal posts.

The perfect job, providing it ticks a lot of our boxes is only perfect to begin with.