I have Grill Grates and move them from cooker to cooker and do get good char marks on my meat. As for searing meat, I much prefer a cast iron griddle.
These are some ribeye steaks cooked on the Grill Grates on a small charcoal grill.
Makes an attractive presentation.
These burgers are on the Grill Grates on a pellet cooker.
Another nice plate with great char marks from the Grill Grates.
More ribeye on the Grill Grates in a pellet cooker.
As for real searing for the additional flavor, just forget the Grill Grates and go with a hot cast iron griddle.
No char but just some real searing for the additional flavor.