Double layer pcba for all cooktops

Why we use 2 layer PCBA for all our cooktops?

1. The cooling for 2 layer pcba is much better than 1 layer pcba

2. Longer lifetime assurance, normally, 2 layer pcba lifetime is double or triple than 1 layer pcba

3. Better conduction, the 2 layer pcba can transfer electricty better than 1 layer pcba