Lmao, if you're not a troll, that's really sad. Please, point out where there are triangles other than the end-caps on the silver part. The pole at the center of the mesh is all quads.
The reasons you don't use triangles is to maintain edge-flow, allow for proper deformations if you will be deforming, and to allow the smoothing algorithm to smooth properly. If your triangles lay on a perfectly flat, hard-surface, then they cause no issues, you could have a giant 24 sided n-gon there if you want and it wouldn't matter at all so long as you surround it by an extra edge-loop. He doesn't have any supporting loops in for smoothing yet, so this is all irrelevant, until he plans to smooth it and add the supporting loops to do that, those triangles are perfectly fine.