When people refer to the engineer "grind" what are they talking about specifically?
Is it the materials? Or is it unlocking the engineers?
Both. See above, unlocking (I hate this word) Marco Gwent. Getting friendly with Sirius - no problem, and not a grind IMHO. Just playing the game. But the Modular Terminals...
Also - I did not really 'grind' for materials, I just entered USS as I found them, drove around on planets, and so on. I have now 4233 materials (raw, manufactured) and 825 data. Sounds good? Not really...
There is no real variation in the materials you can find, which results in 'Common', 'Very Common' and 'Standard' materials I never have seen once! I am nearly full (96/100) in Core Dynamics Composites and other 'Rare' materials. And still lack a lot of 'Common' and 'Very Common', which I never have seen in the game. Normally in a game one would speak of a 'loaded dice'.
So - even if I want to do grade 1-3 engineering only, I still often find, that I never even saw a certain material. The choice is, to look for it, using a lot of external sources, and then
grinding for the stuff. Because looking into USS, landing on planets and so on is fun and part of the game. But looking for something special, which despite the 'Common' qualifier cannot be found (think of Arsenic, for example), that is grind. And more often than not I either loose motivation completely or I just think of impolite ways what Frontier can do with the feature I cannot have...
The grind walls in this game are intentionally erected by Frontier, and instead of adding real game content they bother us with random spawning materials, where the random methods are not even balanced and for long stretches of time give skewed results, with 'Very Rares' coming plentiful and 'Very Common' not obtainable.
Take the Guardian modules/weapons/Fighters. I only have all the modules and do not need the other things. But flying out to the planet with the Guardian structure was fun, and playing the game. Solving the puzzle - well it could have done better, but after 3 failures (nothing fatal, timeouts) the next 6 runs went without problems and in the end were gaming fun. Guardian Data materials are not problem too, there are Ancient Ruins sites on the same planet. And now I can buy the modules in Outfitting. This is clearly no grind, it cost me a week or so, but it was playing the game.
I already mentioned it: I tend to avoid most of the engineering. This has severe disadvantages in the long run. But I will not jump through hoops or squander my hard earned 'Rares' with the material traders just to get things, which being 'Very Common' should be found easily.
The grind in this game is intentional and - sorry to say that - a sign of missing creativity and ideas...