This is often not useful advice, as it is common to acquire responsibility for a tree than has been badly managed. The GP's link actually gives a solution for this case: pruning more accurately over a slightly longer period.

More generally, I've found as the maintainer of a building that while mainstream practices (of property generally, not specifically trees) often undershoot good practice, heritage techniques are often impractically expensive, and function more as a status signalling mechanism than really as a way of doing better. Even more generally, economy-wide; there is a tendency to criticise the mainstream but then promote expensive, semi-artisanal products and services, which while better, simply offer an escape valve to pressure for reform. Better techniques can only benefit the populace as a whole if they are cost reduced under the discipline of serving the mass market, not just offered as a premium version for the well-to-do.