Here is my take. I am (was) a frequent visitor to Malaysia, to see clients and enjoy flying MH.
My quick takes:
1. MH service and food is pretty good in business
2. For me the A350 non-throne business class seats are narrow and somewhat like the American Airlines ‘swimming’ seats. Not so comfortable if you get one. In the unlikely event the A380 is back the A380 seats win hands down
3. A BA/MH mix might be interesting, if available as an option
Unfortunately, Chinese New Year is late in 2021, mid-February, and regional governments are keeping things tight until then, plus allow for 14 days afterwards. The Thanksgiving virus uptick in the US has not gone unnoticed but this is more about proving the intent of waiting until after CNY
That suggests visiting Malaysia in March is probably unlikely from my regular conference calls
In Peninsular Malaysia temperatures are pretty much similar all year round with the late monsoon, from September to December for highest for rainfall. July and August are pretty good times to visit,.