Careful comparing benchmarks of chips that boost and throttle with core i and fans. They are Not comparable.
Well, yes, under heavy load for extended periods of time the MacBook will throttle and slow down while a core i with a fan will not, but unless you're doing hardcore video editing or other strenuous tasks for significant periods of time, you won't notice the difference. So for most scenarios the two are comparable I'd say.
When I had the 2015 MacBook a few months ago I put it under heavy load nearly everyday and it never had a problem. Considering the Skylake Core M chips are ~30% more efficient than the Broadwell Core M and throttle much less, this will be even less of a problem.