Absolutely...depending on the skill of the pilot of course and what stick you bring to the fight. Big ship, easier...small ship, much tougher.
I would go as far as to say that soloing a wing assassination mission in an un-engineered small ship would be almost impossible.
Agreed, I actually think any unengineered ship would find it extremely difficult at best because I don't think any amount of skill could stop all four fully engineered ships burning shields and hull down long before you take the target's shields out. The scb spam would need to be constant and I'm unconvinced normal weapons could out do the FDL scbs.
But that was partly my point. Strip the targets of their engineering and the wing mission would still be achievable with old school balance. But they are what they are because of engineering. The upper end of engineering creates a wildly OTT meta that I can't really say is that fun. It's fun enough once you're there. I kind of enjoyed soloing my first wing assassination in my Corvette of Absolute Shield Domination. But I don't think it has a higher payoff than when I killed my first Anaconda way back when engineering wasn't in the game. It just took a lot longer to get to.
My rather useless nostalgic perspective (we'll never get that balance back and that's that) will always add a caveat to my enjoyment of ship building these days. I accept it for what it is, I meta the hell out of it because I'm not in the business of deliberately crippling myself and I've now completed engineering unlocks and high end ship builds on three commanders, some elements of the process of which I enjoyed, some of which I didn't.
I see these videos, I see the slow floaty materials as they drift in 0.03g, I see shooting a blaster at a shard at a slightly wrong angle so it doesn't pop (or any angle and it doesn't pop) and I see people logging in and out and I can relate to the humour. Quite a lot of the process is pretty average stuff at best. But I'll take the shard sites because they're a lot better than prospecting for that stuff normally.
I'll take Dav's Hope for g4 mats on a new commander. I'll take the easy, repeatable HGEs to trade across and I'll happily fill up on the 3 mission g5s whenever I can. But it could all be a lot better. Just like some missions could be better.
At least fdev agree with the part about material gathering and the trader. They're looking into them and it'll be great if there are improvements over the next year or so.