About the alledged Hispanophobia and Black Legend
Better than English sources, read Spanish sources against the myth of the Black Legend. The idea behind the Black Legend is that is built around the nostalgia of when Spain was a great empire.
It is true that the compendium have a little bias agains the Spanish, but that is all. Because Spanish appears as the bad guys in Act I, but the Russians appears dehumanized as strelets pawn hordes without proper characters in Act II (you remember the strelet devilish portrait in vanilla?), and the British and USA as bad colonizers in TAD and Shadow campaigns.
Why the Spanish are the enemies in a lot of games in the early modern history? Because usually you play as the small against the big empire, and Spain was the big empire at the moment. It’s not fun to play the big Empire and win, there’s no challenge. In other games around American independence, the British are the bad people. But I never haven’t heard about Britishphobia.
It’s true that they have been overfocused with the Inquisition thing, and that has to do more with the Monthy Phyton gag than a Black Legend
Guerrilla
Spain didn’t invented Guerrilla Warfare. How old is ambushing in military history? Feigned retreat? Light skirmish units?
Citing Iberians (Lusitianians weren’t Iberians, BTW) to justify a genealogy of what Spain did 1400 years after (if we salty take the creation of Spain on the union of Castile and Aragon crown) it’s clearly national essentialism.
Gameplay
Back to the real topic: Spain, when the automatic crates with logistician were implemented, was clearly OP, they have to be nerfed. I don’t play Spain so I don’t know if they are in the right spot now, it deserves a balanced place, like every civ. I main Russian and Spanish Logistician still makes a solid push.
Why the Spanish are archaic and have morrion helmets? Because it represents the height of their empire. You don’t like that they are represented in the old way and they should have a more modern army? Other civs also get a lot of early modern era theme, like Sweden, half roster of Germans, Japan, probably China, half roster of Ottomans, Holland… Rodeleros are a bit off because they were used like 30 years only in the Tercios, but they represent spanish conquistadores that went against Aztec and Inca empire. The bonus of Spain are related to arrive the early in the Old World and having a powerful empire in the early modern time.
As Spain, you aren’t relegated to train Pikeman and Crossbows. You can actually train Musks, Skirmishers and Hussars. Clearly they aren’t the best, but Spain wasn’t a powerhouse during XIX century. Except Bostanci Hussars, other musk, skirms and hussars royal guards are related to late XVIII-XIX, when Spain lost their colonial empire. Do you want to represent Spain at their height or not?
Proposals
This is where I go purposeful with you, from a no nationalist POV. Two ideas:
1/ Spain didn’t invented the Guerrilla warfare, but it’s very fair to say that they kicked the ■■■ to French in the Peninsular War, and gave the name of warfare that existed before, to a common used term in English, French, German, etc.
Some card or bonus could be given to them but with caution to avoid making them OP with the Missionary aura.
2/ Speaken of, Inquisition and Religion. Religion had (like every European empire at that time) a very big importance regarding power and rule, but that thing wasn’t exclusively Spanish. It’s true that Spain was a Catholic faith keeper, but maybe it could changed to avoid the Inquisition tone of the Missionaries.
Maybe, the Unction card could be changed the name to Curas Guerrilleros, giving to the Missionaries a new skin based on a mounted Jerónimo Merino
That would be based on the history that some priest were guerrilla leaders in the Peninsular War.
3/ A historical scenario with the Spanish would be cool. The Napoleonic invasion of the peninsula would be a great topic to explore, it could fit an European themed DLC with that modern flavour that you want.
(Edit) 4/ For flavour, although I think that it doesn’t bring much value, Cannoneers and Conquistadores cards could be given to Spain and Portugal.