I think that Insahnity post says it very well but I would like to add that while its good to be soft capped on both hit and expertise it far from required. Some ppl look at tanks (or dps for that matter) who are not both hit and expertise soft capped and call them idiots. I think a big part of this comes from the fact that people (who are not much into stats) tend to forget that even if you would have for example 0% hit you would still hit with the majority of your attacks.
Reading various recruitment forums for guilds on my realm I have seen that peoples opinion on how important caps are varies largely.
One has to remember that the option to be capped should always be weighed against something else, some other stat that you might be able to get instead. Beeing hit capped or not while tanking (assuming both cases generate a lot of threat) is largely a choice of whether removing the RNG that comes from not beeing capped is worth more than what you lose elsewhere by doing it.
We have a lot of boss fights requiring tank swaps todays which can become very complicated if a taunt fails. On the other hand we have a lot of fights requiring every possile piece of survivability possible. I tend to carry a few off pieces with me so I can be chose which is most important per fight. That together with extra glyphs as Insahnity said does the job.
Another example involving expertise is my current dps spec/gear where while expertise is a nice stat, it is still gives me less dps per point than strength does even though I am below soft cap. Hit on the other hand is worth a lot more per point than strength if I am below soft hit cap so while my expertise is very low (and this has to do with the fact that enough of my attacks are magical) I would never go below soft hit cap.
To sum it up what I wanted to say is that remember that while one way might be more correct than another when it comes to caps, the way thing usually isnt too bad either

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