Because I just started with a loaned sidey and will be buying a Imperial Cutter in the first month.
I think you may misunderstand what some people define as a grind. They're not saying anything's impossible, more that the actions required to reach the point they're aiming at are boring and/or repetitive to them.
I can understand why to some extent. I recently did the trading CG at Redi market. I probably spent four or five hours running the route. Pretty much the same route, although I guess I ended up using three different supply stations. Personally, I find the degree of repetition relaxing. The fact I'm flying to and from the same stations matters little to me. I find the SC journey interesting, because I try to ensure I drop from SC facing the slot, and that isn't always easy. I had to dodge some interdictions, sometimes I dropped and boosted, sometimes the minigame, and before I swapped to a trade laodout I killed the pirates.
I had a great time over the 5 hours I played doing (at a high level) exactly the same thing, but at my fingertips actually permanently reacting to what's going on. I litreally haven't got time to reply to chat messages. I'm always working in SC to maximise my alignment (unless the station is much over 1000 ls away). The second I've landed, I hit "Enter Hangar". Before that's finished, I've bought/sold what's needed and hit "Launch". Before my ship is released, I've selected my destination system, and plotted a route directly to my target station, then, whoosh, I'm off again.
Anyone who thinks landing is a chore, or maybe has an autpilot, or regularly lands behind a station and has to fly round it might be feeling the game is a grind. Basically, if they aren't engaged by what they're donig it's boring and a grind. I think the only element of the game I potentially regarded as a grind is SC out to 200k ls or something. But they've added the News bot now!
Any game played to exhaustion is probably going to feel like a grind. Some of the salt about grinding (I'm sure there's a joke in there somewhere) probably includes some element of FOMO because they can see people who are loving playing ED, and they want to feel like that, but just don't.
I guess the game isn't for everyone, but I love it.