Well, tech by itself is such a tiny bit of the world that it won't take one far either - after all, people are quite more complex than that so relying on only one skill shouldn't even be something to contemplate, no.
That being said, the crucial thing is really the what and with whom - the companies you mention really sound like the usual fashion-chasing (not to say chumpatrons directly) places so not even promotions there are going to do much for anyone (quite on the contrary really but that's for another day).
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We're a place where coders share, stay up-to-date and grow their careers.
Coding by itself should NEVER take anyone far.
Coding is just filling codes into files, I know it's a daunting task, but not so many will appreciate that job.
Actually, "coders" are treated like toilet paper (used then thrown)... You realize that once you see a high turnover rate in many companies.
Now here is the thing, "coders" are very different than "engineers" or "developers" or whatever higher rank.
Those are more valuable to the business, they're more recognized, and they get promoted faster (even into managerial positions).
Well, tech by itself is such a tiny bit of the world that it won't take one far either - after all, people are quite more complex than that so relying on only one skill shouldn't even be something to contemplate, no.
That being said, the crucial thing is really the what and with whom - the companies you mention really sound like the usual fashion-chasing (not to say chumpatrons directly) places so not even promotions there are going to do much for anyone (quite on the contrary really but that's for another day).