There is a difference between being aware of how easily something is countered and not playing it at all.
Special Energy cards are already very easy to counter; Enhanced Hammer is not a new card. Prior to rotation, we had to worry about Vileplume (XY: Ancient Origins 3/98) and its Ability in Standard, and multiple forms of Item lock in Expanded, and in both Garbodor (SM: Guardians Rising 51/145) and its "Trashalanche" attack. This made Enhanced Hammer less appealing. In Standard, now it is down to Garbodor, and more decks have either high enough or low enough HP attackers that Trashalanche isn't quite as scary. In Expanded, while Vileplume lacks Forest of Giant Plants due to the latter being banned, there are still many forms of Item lock but other anti-Special Energy strategies to consider.
While they don't specify Special Energy, we must consider general Energy removing tactics as well because it is not as easy to reclaim Special Energy from the discard or search it from the deck as it is basic Energy cards. Basic Energy has cards like Brock's Grit, Energy Recycler, Energy Retrieval, Professor's Letter, and Super Rod (and a few more in Expanded). Most of these aren't heavily used, but they exist (and some work with Pokémon and not just Energy, a bonus). Special Energy requires Energy Loto (which works with basic Energy as well) or the rare, coveted general search (like Computer Search) to fetch them directly from your deck. We have Puzzle of Time and Special Charge to reclaim them from the discard, and believe me that is pretty amazing; the only time it has been easier to reclaim Special Energy from the discard is when Lysandre's Trump Card wasn't banned. XP
Still, adding two Special Energy directly from discard to hand requires Puzzle of Time, but two basic Energy requires only Energy Retrieval or Starmie (XY: Evolutions 31/108). So Crushing Hammer, Plumeria, Team Flare Grunt, and Team Skull Grunt still hit Special Energy cards harder than basic Energy cards. I can't believe I almost left off that Special Energy must obey the 4 Copy Rule, while basic Energy are only restricted by a deck needing at least one Pokémon capable of being your opening Active. I wouldn't recommend it, but you could run a single Basic Pokémon with 59 basic Energy cards if you wished.
Yes, yes, that is rather long and probably seems unnecessary, but the ultimate point is that Kartana-GX is just tipping the scales. It is already a complicated mess when one should or should not rely upon Special Energy cards!