The person who made the remark of "just give us these to harass the underground dwellers:" I am giving him/her the benefit of the doubt as it was a joke type remark, but there have been many remarks of that type not only in the Devs Diary but some time back on the discussion board one that some (and I was probably one of them) got very testy over such a viewpoint.
I don't like the idea of someone decided how I should play a game that allows freedom to play how you want. If TFPs decide to add digging zombies, or teleporting ones, or invisible ones that is different. They are the devs and can do what they want with the game. It reminds me of someone who posted some time back of how everyone should play on default always, that if you didin't you were cheating. Options were given by the fun pimps so a variety of players could play the game. For those who are experts at such games they can make it harder, if you know how to mod you can change it so you have more zombies, or replace the average zombie with the more dangerous ones.
I don't know anything about programming, developing so I don't know if it is possible but for those who want the challenge of digging zombies, that see it as a positive, couldn't they make it a option in the Warrior or Insane or whatever is the highest setting? Fix it so those who feel they are advanced enough, are a expert, experienced player can have that option. A toggle or something that lets those who want diggers can have them and those who don't are able to leave them out. Not everyone can mod, for those who don't know how it could be a game breaker.
On jumpers, I think that is a good idea, not wild about the stupid spider zombies but that is because it should be able to crawl over the overhangs, not get stopped by them. The jumping jack behavior of the zombies is silly, frustrating and time wasting, same as when they decide to make circles instead of attacking a player. Smell is messed up from stealth, stealth probably needs some work but I think for the most part it is good. Sleepers constant respawning, which had been fixed in a16.3stable became screwed up to the max in a16.4 experimental and probably won't be fixed until a17 (a guess on my part, hope I am wrong). Zombies who are the highly dangerous ones don't drop loot and there are a slew of problems.
BUT, the game is great and has so much potential that these problems can be lived with for the most part; although for some it is so bad it is game breaking. I don't think TFPs are ignoring it, they are probably working on it, but it is a problem.
I am hoping that we can put the digger zombies to bed for a long time and let TFPs make the decisions on what they want in the game and hope it fits what I want, highly likely it
won't, but I can still hope.