I think the triangle evolved as the only person in the kitchen was the wife/mother. It was a great idea when there was only one person cooking and cleaning. but in today's world where we have multiple cooks, etc. It sucks. My kitchen was great for my mother. but with my partner and I . . . yeck. I don't have room to do dishes when he cooks. Getting into the cupboard where the pots and pans are stored is a nightmare to say the least ! My answer is a resounding NO !

That's more then enough space between the island and bifold door, and the island and the sink, not to worry. For your peace of mind, the island can be moved around before the final stage of installation, so just stand in front of it and check the distance, open the doors especially the dishwasher door and see if you can move around comfortably. If you are happy then let them finish the work. We had to move this whole island with the quartz as the ceiling lights were fitted slightly to the left.

If you are going for a natural stone /granite etc type top - that might limit you, if you don’t want a seem, as they are only available in certain sizes . Also its wise to go for a size that you can easily wipe without over stretching yourself ! Think about how you will get it into the room too -as they can be pretty heavy !

As he supplied and fitted the kitchen, then he really doesn't have an excuse for not knowing the sizes of the cupboards to which you were referring and wanted replacing. However, if he wasn't sure he should have double checked with you. Plus he should have ensured the drawers he was making up, were the right size before constructing them. Personally, I think it's all down to him.