Some valid points for such a condensed article.
However, contrary to common belief (and mine until recently), 'active' isn't synonymous with amplified: it refers to the fact that the filters/crossover are before the amplifier. You can have amplified passive speakers and non-amplified active speakers.
The author advises to listen rather than decide on specs, and quite rightly so. Now that i have made the mistake more times than not, i would add to that: listen rather than trust reviews or tests in the specialized press.
Finally, it is worth keeping in mind that the cost of the monitors you are about to buy from a retailer is less than the VAT alone. That's right, they usually cost about 10-20% of the retail price to make. Those 7000€ monitors from that very professional monitor company you've been dreaming of use 20€ tweeters and car subs for woofers. So bear in mind when you are paying 400€ a pair you might be getting components no better than what you put in your car.