It the OP, but there’s a difference between holding a moral opinion and stating that opinion in a discussion. OP may simply have not wanted to obscure information presented from an insider perspective with personal opinion, in an attempt to stay objective.

Further, financial engineering by itself is morally neutral. It can create abuses sure, but it can also reduce unnecessary costs so that a company can employ more people, offer goods and services to customers at lower prices, etc. Tax is just one piece of a much bigger puzzle and it can’t always easily be disentangled from other issues.

I’m reminded of the saying about porn, you might not be able to define it, but you know it when you see it. There are plenty of publicly discussed cases of pretty clear and egregious tax evasion, but not all efforts to limit tax liability are abuses. Some of them are responses to deliberate incentives put into the tax system to encourage specific behaviour.