@Brudru,
Not sure of the date of John Palmer's comments, but I think that his opinion regarding kits was probably an accurate assessment of those prevalent in the market a few decades ago. I imagine there’d be quite a few forum members who, like me, can still remember sourcing their one-can kit and kilo of sugar (with what seemed like baker’s yeast!), from the likes of Boots the Chemist back in the 80s and early 90s.
Results then were questionable. It was certainly homebrew, together with its inevitably distinctive homebrew twang at best, but reminiscent of stewed cabbage at worst! Nevertheless, it was cheap. It definitely got you p*ssed, but only if you could get the stuff past your nose! It was never going to be prize-winning - no matter how carefully the brewing process was managed.
Nowadays, the average homebrewer is really spoilt for choice. The quality of ingredients has massively improved. Extracts are much more carefully produced and packaged. Yeast varieties are true to type. Equipment (and information) available to the average homebrewer is much improved and affordable, enabling more careful management of the entire domestic brewing process.
I’m far from ‘pro’ though been homebrewing a while and still mostly brew from 3kg pouch all-extract kits (Festival, Mangrove Jacks). I've found these to be top quality kits, which also include dry-hops where appropriate and additional dextrose only for higher ABVs. Particular recommendations being: Festival’s Razorback IPA, Belgian Pale Ale, Belgian Dubbel, NZ Pilsner, RIS, Summer Glory, Pilgrims Hope, MJ's Juicy Session IPA.
I’ll be reporting back shortly on MJ's Dry Irish Stout - on the go in FV at moment and already very promising. (Ritchie's Festival and MJ now all part of the same international Bevie ingredients manufacturing group). But there are others of similarly high quality. The Youngs American IPA is already next on my list, as it seems well-reviewed by plenty in the forum here.
In any case, whether using kits, boiling extract, or full AG, good results depend heavily on all the exact same issues regarding proper sanitation, and careful management of a healthy fermentation process wrt temperature and timing. If badly managed, then whatever the process upstream - whether from the best kit, or after eight hours of full AG - results will be spoiled.
There’s no questioning that results from ‘top quality’ (3kg pouch, aka two-can) kits can be excellent. In no time at all you’ll be producing IPAs, Pale Ales, Belgians and Stouts, which if done with care, will definitely challenge much of the commercially produced mainstream bottles available on the average supermarket shelves.
Whatever your future plans, everyone’s homebrew experience is a journey, and the equipment necessary for kit brewing is all the exact same stuff needed when, and if, migrating on to extract mini-mash, BIAB or full AG RIMS/HERMS - if that’s what you later choose to do.
If brand new to homebrew, then starting that journey with quality two-can kits will at least allow you to practice and hone your fermentation and packaging processes with a lot less upfront time on wort production.
Never underestimate, however, the importance of advice elsewhere regarding the need for patience in allowing the brew to properly condition. 2+2+2. Two weeks in bucket, two weeks in bottle, two weeks to condition!
Good luck, and Cheers!