main reasons for me:

1) seems hard to get something with decent progression outside of b4 unless you constantly change jobs, a lot of my seniors left and well i stayed and my pay is higher than them. theres of course a couple that left and making big bucks elsewhere but they are rare.

2) i get a lot of autonomy in the way i work esp since im 90% WFH, don't know if i can find this kind of flexibility elsewhere. i generally wake up pretty late cause im a night owl, and nobody really cares as long as **** gets done

3) offpeak is really quite lepak (but this is also luck dependent, some people got full year peaks)

4) i personally enjoy about 50% of the job, the other 50% is what makes me want to quit though