The MBP is targeted for pro-user, they will need a laptop capable of doing high workload task like compiling programs, rendering videos etc.

These types of workloads demands for a powerful chip. To achieve this, the MBP needs to have a higher thermal budget to work with and with that, it is capable of ramping up to a higher clock speed and the ability to sustain peak performance consistently for a long period.

I believe the MBA will bursts out its peak performance only for a short period of time and throttle afterwards, otherwise the heat will start to build up.

what is this desolder issue? do you have link especially about the celeron w/o fan?