That is...exquisitely false. Especially under the tensions of scale, architecture matters a great deal. Yes, computers are ridiculously fast these days, but it is quite easy to architect yourself into a situation that cannot be solved by more hardware, not even theoretically. There are plenty of problems that would require more memory than there are fundamental particles in the universe if you model them wrong.

As for your offered examples, you seem to be thinking in terms of glue code and how well it could be replaced by an intelligent agent with its attention focused on a browser, reading one tab and entering data in another. This approach is going to break at any kind of scale greater than 1, and probably be quite brittle at 1. I'd argue that such an agent, if properly trained, will quickly realize that the cost/benefit ratio of it doing the job manually is not nearly as good as if it wrote a program to perform this mechanistic task. In which case, architecture still matters but the agent doing the architecting has changed.