There are many reasons why you would want to move to HK or rather move out of NYC and I am sure you have considered them all. Since you asked for an opinion on tax benefits and whether your mentioned salary is comfortable. Here's my take on it.
PS: We moved from NYC to HK 2 years ago. Idea was to do 2 years, but as they say, its either 2 or forever.
Is your salary comfortable - I think it is very much. If you take your base pay, you have a base monthly salary of HKD 107,250 per month less HKD 1500 deduction for retirement plan contributions = HKD105,750. Spend HKD 20-23k for a large studio or decent 1 bed in mid-levels, sai ying pun, etc (i've seen many in my recent search for apartments), HKD 1k for utilities ... thats all your housing taken care off.
Tax situation - based on HKD 1.5m total pay, your tax bill for 2019-2020 year will be HKD 211,500 or 14% ... good savings from 24% in the US.
Take home pay situation - this is where things need to be weighed in. Lets look at line by line what gets taken out of your paycheck in the US and see whether it is a benefit or not:
Social Security/Medicare - You will not be contributing to this fund. Your SS statement will show $0 annual contribution. How does this affect your retirement benefits is what you need to be able to accept. Maybe this is a benefit, since your views maybe that you are anyhow not going to get anything out of it.
401k - even - you can chose to participate in your employer's retirement plan here in HK. For HK taxes you can only deduct HKD 1500 per month max. You cannot deduct contributions to HK retirement plan on your US taxes. I personally contribute just 1500 a month, declare on the US that I don't participate on employer retirement plan (I've deliberated on the rules a lot), and then contribute separately into my pre-tax IRA account in the US to build some retirement savings. I also aim to contribute in my post tax brokerage account as well. I used to max out my 401k contributions when I was in US, but here in HK, I split that contribution into IRA and brokerage account.
Medical, Dental, Vision - Hopefully your employer in HK will cover this .. preferably in full! - If yes, def a benefit as you don't have this outgoings from your HK paycheck.
Transportation - even - you will not have expensive monthly passes, but then you may end up splurging on taxis coz of hot weather. In HK your spend will be in after-tax dollars even for public transport.
NYC Taxes - Benefit! - no more deductions for these.
NYS Taxes - Benefit! - no more deductions for these.
Fed Taxes - Benefit! - USD200k - USD103.5k (foreign earned income exclusion) - USD15k (estimated housing exclusion) = USD69.5k AGI - $12k standard deduction = USD57.5k taxable income. Determine tax bill - credit for taxes paid to HK (adjusted portion) = Tax liability to US. You will find that this number is slightly beneficial compared to what you would have paid while working in the US.
hope this helps!