As the support environment is intensive and fast paced, it's quite easy to fall behind.
While you take the opportunity to do training you could be seen, unfairly, as a slacker, because of course you fall behind. Then you'd face an uphill battle with minimal assistance from your seniors. So, yes, opportunities are there and it will cost you time. You have to work extra time to make up for it because you cannot afford to leave it to the next day.
Even if you do a good job, it is thankless and a pat on the back is a rarity. So, many see their job simply as a job and not a career. I've never seen so many sad or scared people.
The major disadvantage to the growth is there is an explosion in the management structure which is quite bureaucratic, somewhat flat on the lower chain, and there is no consistency in how they work. Speaking from experience and observation, there are some managers where they maintain distance with their staff. Then there's those who like to micromanage, which simply does not work well.
This leads down to quite a bit of infighting and no clear path for progression. In fact there is a hint of favoritism from upper management when it comes to promotions leaving other well deserving people in the lurch.
