The FRW is a nice isotropic and symmetric metric but I think its assumptions are too many. I was wondering about alternative models. Specifically are there any prominent alternatives that have more fleshed out local detail? For example, are there any models that can ascribe a more local interpretation to data which was considered as crucial support for the Big Bang.
An obvious example is the Hubble bubble though this doesn't invalidate the FLRW model, it just means the homogeneity is on a larger scale than the observable universe. However I get the impression the Hubble bubble idea is not widely considered likely.
There's also the Mixmaster Universe, studied in the 1980s. I'll give a couple references: