Engineering mats: grind! (somewhat better with the new system, the old one was just worse)There is no grind in Elite. People want things faster than intended, that's what creates what you call grinding.
Travel to Colonia - jump, honk, scoop, repeat - grind!
Unlocking the guardian modules: Scan the obelisks, log off, login, repeat - grind
or even worse: the blueprints before the nerf: Kills sentinels, shoot pylons, scan ball, log off, log in - Repeat! Do that 24 times for 3 modules. Grind!
Grind is anything that is just mind numbing and repetitive. And Elite has plenty of these gameplay loops.
Yes, other games are grindy too, but they make it more appealing. I love playing Diablo 3 for example. Sure, get to level 70 then run rifts until end of season. But every rift is different, monsters have different abilities, and it's not the same loot every time. Also you do get to progress, better gear allows you to run harder modes, for more challenge. That's called EndGame. Elite lacks that part big time.