Max out attackers?

Its just that extra 10-15% is usually overkill so people focus on defenders. Nothing wrong with upgrading attackers honestly if you have the spare resources.

I agree that the defender metagame is really really boring right now.

I always max out attackers, saves time and potions.

I am now at that point where all my defenders that are level 91%+ with an "A" defense move are maxed out to level 36.5 so am now maxing up the attackers that have "A" rated attacking move and are 93%+ starting with D'nites, blissey,Tyrs,Champ,Snor....I am lucky though that I have over 2m dust

I understand you. If not for the expected gym overhaul I would not have over 1000 stardust at the start of any day :). But now I have 372k and invest only on Tyra as he finds his candies.
Ah, I just maxed my big Blissey (instead of leveling second one above lvl 30), that is fun, you leave her 3091 CP in a gym, see the fighting fire and after 2-3 minutes you see the prestige at the exact same value :).
But I do fight with 3 maxed or almost maxed pokes: my hp vape (my highest one, but he fight, the gyms are for big WP and AT ones), my DT/H Dragonite, my low IV Db/Dc.
For now the others don't give me fears, I don't really expect them to go all the time through 2 defenders, what I will use my generalists for? :).

is about being high level too, not only about CP, this is why there is good prestigers, they are high level but low CP

that is why powering up attackers is also good, especially those ones with great movesets, no matter if it has iv 0, its about being high level, iv will only matter for gym placement

Same here, attack is way more fun than sitting on your couch waiting for the same old mon's to be kicked out of gyms before you get in your car and replace.

Pokémon Go was originally promoted as a game encouraging fitness and community engagement. Oh the good old days.

As more and more people get to a higher level, where they gain a lot more stardust between levels this is indeed becoming a viable option for a much greater % of the player base. This is part of the changing 'meta' as a larger portion of the player base reach the higher levels.
The massive difference in catch/hatch quantities it takes to go from one level to another leaves people with more resources such as dust and candies than they do at lower levels.

Of course it costs more to 'train' a mon when at higher levels, but the proportion of dust it takes in comparison to the amount earned between levels is vastly different - so players at higher levels have more resources to use, before they need to concentrate solely on defenders after levelling.

The suggestion to take attackers only to level30 is still valid for players in the lower 30's...where the return on investment is not noticable for attackers, and resources are more scarce.

However, once players get to mid or higher 30s then the resources are available to a player to use on attackers - and the difference is enough to make a noticable performance improvement.

It is not that the advice once given is inaccurate - it is that the advice is valid for specific player levels...and changes as you get to a higher level, based on resources available and the return you get for the investment of those resources.

TL/DR What is good advice for a player at lvl32/34 is different to what constitues good advice for a player at lvl35+.

Upgrade your attackers. I've never heard to not upgrade them before and that's terrible advice.

I don't hold a lot of gyms because they turn over like crazy here. I like to have my A team because I'm OCD like that, so I definitely max out my top attackers. Many are also formidable defenders including my Eggy and Dragonite.