In load and weight - probably in FMS/FMWC - need to support kgs as well as lbs.
Many of the more hardcore sim-pilots use realistic company procedures, load and weight and fuel planning. Metric units are essential in most of the world.
I totally agree.
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A million times yes. I’m using SimBrief to generate flight plans and I always have to generate twice: once with LBS to use in “Weights & Balances” and once again with KGS to use in the MCDU.
It’s actually funny when you consider the real-world problems the necessary conversion provides and how they implemented these problems into the sim. 
This is already well discussed in here:
There is an existing thread with far more votes, please go to that thread and continue your discussion there. Metric Units!
Closed as a duplicate.