With a few limpers and stacksizes that arent rediculously deep (like 20+ BB both of you) which they extremely rarely are in STTs, you need to push this.

Because:
1. It can as you say get awkward to play postflop OOP with shallow stacks.

2. AK is one of the best hands preflop and youre basically not afraid of any other hand calling you.

3. If you move in and get called, you get to see all 5 cards 100% of the time, which is optimal for AK for obvious reasons.

4. You certainly dont mind picking up the blinds here, which you will do most of the time.