I think the idea is that you learn which enemies can drain you, and then you do your best to avoid them. Landing in a room with a bunch of Time Hounds is lousy luck though. Ideally you'd have telepathy so you wouldn't have to use a turn to detect them. NPP-derived variants try to always start the player in a little cul-de-sac so there can't be lots of enemies in LOS right at the start; Vanilla should probably steal that feature.
The way I handled experience drain in Pyrel (which I have, alas, been too busy to work on lately) was to have it temprarily drain entire character levels, and it'd stack. So getting hit once usually wasn't a big deal, but getting hit ten times would be a big problem -- which would go away on its own after a bit. Something similar could probably be done with stat drains too: make them bigger (percentile?) drains, but only temporary. I do tend to agree that permanently "damaging" a character is pretty lame.
As for house size, if it weren't so intractably tied up with the size of stores, I'm pretty sure it'd have been made gigantic awhile ago. Practically nobody thinks that the current house size is important for any kind of gameplay reason, and there are a lot of players who want to be able to hoard more loot.
The way I handled experience drain in Pyrel (which I have, alas, been too busy to work on lately) was to have it temprarily drain entire character levels, and it'd stack. So getting hit once usually wasn't a big deal, but getting hit ten times would be a big problem -- which would go away on its own after a bit. Something similar could probably be done with stat drains too: make them bigger (percentile?) drains, but only temporary. I do tend to agree that permanently "damaging" a character is pretty lame.
As for house size, if it weren't so intractably tied up with the size of stores, I'm pretty sure it'd have been made gigantic awhile ago. Practically nobody thinks that the current house size is important for any kind of gameplay reason, and there are a lot of players who want to be able to hoard more loot.
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