Positive:
You don't keep running back to town for a ton of arrows and selling stuff. That's just boring. If you're really trying, you might have even tried to check every time the elite object guy was selling. This was boring.
No hovering next to stairs for easy escape which feels like cheating
Identifying potions, equipment and mushrooms becomes a lot more fun. Um, I have no food left! I guess its time to id the mushrooms and scrolls
Rules: Never take up stairs or recall. If you accidentally recall from id by reading, don't use the store or stairs, just recall back to where you were by buying a scroll( you should have enough gold). If you find down stairs, you don't need to take them until you're ready.
Spoiler strategy:
The only sane approach is Half Troll warrior. It sounds far fetched since they need to eat twice as mutch, but you need the brute strength for extra attacks to fight orcs and trolls before you have: Phial and enough
food.
Sell everything you have to buy food/light. You may want to keep your weapon. You may want to add to the challenge by saying no town even to start.
You will want to clear the first 5-10 levels and just go down stairs without resting for wandering monsters.
Once you're about 10-20, you need to figure out if you want to rest or go down in stairs.
I go down in stairs if:
I'm getting low on food, fresh levels are more likely to have food.
There's a boss critter I can't handle. But going down in stairs makes it more challenging, so you might end up spiraling downstairs to a death condition because monsters are too tough.
When light is low, I dive for more light. Remember to make your rest macro remove your light before you rest. If you're really detail oriented, have a light removal macro when you enter rooms with light, but I find you don't need this. Light isn't as big as a problem as food(but is a possible loss condition)
The results is sometimes you dive further than you want to just to get food/light or avoid a boss or situation. Then you need to be aware of monsters that paralyze or breath you can't resist. It feels great when you get a Phial, or pile up satisfy hunger scrolls.
Now other classes can win! I especially started with the cleric/priest/druid or whatever gets a book of satisfy hunger, but I find that Morgoth needs to be whacked in melee, and the best melee is a fighter to do damage quickest. Also there's nothing more annoying than getting belted with a bunch of flames and your spell books all disappear and can't easily be restored. Play around, see what you can do.
No up stairs Angband is a whole new game, one which actually has challenges you can't exploit your way around. I'd say its one of the best games of all time, but few people even know about it. Make sure you get a version with autosquelch so the end levels don't slow you down sorting through trash on the floor.