For the people crying about engineered bases
My assumption of these people crying about engineered bases are probably in a bad terrible attacking clan. Either get good, have your teammates get good also, and build better bases or find another clan that can cover these engineered bases.
An enemy clan having engineered base(s) doesn't guarantee a 3 star. They also have to attack correctly. BUT if the bases (complainers about engineered bases and/or clanmates) these engineered clans are attacking are regurgitated internet bases, I don't see how your opposing enemies will fail.
The most simple engineering ever
If you have everyone in your clan build no more than 2X mortars and that is the ONLY engineering you do, then by the time you guys get to near max TH9 you will be winning almost all your wars.
That is the power of strategically upgrading your bases. I use the plural intentionally since engineering is all about shaving off a little weight on each base without compromising its effectiveness so that CUMULATIVE clan weight is notably lower.
People need to look at war weight and ask the question is this worth it for my goal?
Maxing everything is worth it if your goal is to be as strong as possible in order to defend in regular matching since there you are matched by town hall. In war its by weight and something like mortars is extremely high weight but 2 of them maxed and strategically placed in a good base layout will serve their function which is stopping massed tier one troops.
Another good trick is to use mixed walls. You don't need every tile maxed, some are for funneling enemy troops to where you want them.