I thought I might make a few observations.
1 Performance
Throughout HR there are numerous pages reinforcing the critical importance of a good performance in achieving a good recording. I've also advised this, adding that it is risky to fix things in the mix that should have been fixed in the tracking, and to fix things in mastering that should have been fixed in mixing. Get the sound right at the start, and everything else falls into place. I can't read anything in TG's post that suggests adopting the Ancient Art of Turd Polishing. What he was referring to was the pre-emptive action taken in the past to deal with known and expected problems that would be encountered later in the recording path.
2 Technological realities
I have no doubt that some microphones are better in some areas than others. For example, my go-to mike for violin is an AT853, normally used for ensembles. But I have yet to find anything better for capturing the detail of a violin. It follows that some mikes will be better suited to some voices than others. Having said that, even though I prefer the AT853 for violin, it doesn't mean the others sound bad. They do a very reasonable job.
The Shure SM7b is around $400 to $500 in Aus, maybe less if you go to ebay. I expect that any vocal mike in that price range is going to be broadly comparable in quality, and will deliver reasonable results. It may not be an exquisite match to the material being recorded, but it should not be disastrous. This broad comparability extends even more, in my view, to interfaces and preamps. This suggest to me that if you have problems in the quality of recordings, you should look first at other areas of the signal path, before considering replacing the technology as an answer.
3 Real-time vs Post-tracking processing.
When I first entered the digital era, I had an ISIS soundcard. I used this with a mixer because the ISIS was line-level only. I also used the EQ on the mixer, as well as a number of outboard devices (compressor, etc), mainly because they were there. I eventually ditched the ISIS in favour of Presonus, which had its own preamps. Despite this, for a while I still used all the hardware, until I realised that I was causing myself unnecessary grief. By adding EQ, compression, whatever, while tracking, I was actually creating my own unpolishable turds. What is done is really difficult to make undone. These days I have nothing between the mike and the interface, i.e. it is just the raw signal that gets into the machine, and I relish the fact that I can now change my mind. Wrong EQ? Okay, try something else. This is a flexibility that opens so much scope in recording.