The only way you compromise growth by moving is if the investment options are worse (what are you're options at the Fidelity 401(k)?) or if the markets happen to go up while your funds are being moved as cash (but the could just as easily go down, so not really worth worrying about).
The fidelity options include several sub-0.1% funds including VANG TOT STK MKT IS (VITSX) at 0.03% and target funds at 0.07%.
Definitely roll it over. You have few accounts to worry about and this plan has better investments options than your previous plan.
VITSX is the institutional class version of VTSAX, available only to plans with at least $5 million in the investment, so it's exactly the same as VTSAX but with a (slightly) lower expense ratio.
On the Reddit guide to rollovers, it says:
Roll it over into an IRA. Note: this may not be a great idea for pre-tax 401(k) plans if you have a high income that is above the Roth IRA contribution limits and are planning to do a backdoor Roth IRA in the future (due to the pro rata rule).
Does that apply to my situation given my income? I see that the MAGI cutoff is $122k, so I should be safe. Am I missing anything?
Yes, you're near the cut off for making direct Roth contributions, so you may find it advantageous to be able to make backdoor Roth contributions. For this reason it would be wise to either leave your 401(k) where it is or roll it over into your new employer's 401(k).