History has shown us (history is really nice about showing us things) that Modern rewards great knowledge and familiarity with an archetype. For example: Sam Pardee with Pod (and now Twin), Shaun McLaren with UR/x decks, and others. Because Modern a very complex format, with a lot of decks and complicated lines, understanding how your deck functions and being prepared for proper sideboarding/role switching is really important. Metagame calling is a great tool as well, and plays an important role in sideboard construction/deck choice, but unless the format has shifted to a point where things look very polarized (Ramp is dominating, too much midrange, etc) you can be confident that great deck knowledge will aid you in an event/season more than constantly switching decks will.

There is a spectrum to this however; if all you know is Grixis Control and everyone is gunning for Grixis, you will be disadvantaged when running headfirst into a hostile field. So, practice a deck, master its intricacies, but be prepared to audible if necessary.

Very likely.
Jund has an even matchup against Grixis. Abzan on the other hand smashes Grixis and Jund for that matter. If you expect a field heavy on those two decks Abzan will serve you well. You are still playing a BG/x deck in the end so it’s not like you are playing a meta deck that has no chance against other random decks.

Also note junk than Jund. It’s this due to the grixis control Matchup and the better threats in junk?

The article was a good read, keep it up 🙂

I hope Brimaz will go down with the rotation, because I really think he’s a good one for modern and I’ll buy some then.