I agree with this. In Test, I fail to understand how keeping one end tight creates pressure. In limited overs cricket, it makes sense, and might be a reason why Broad is a success in those formats. But the only way to create pressure in Tests is if you bowl beautifuly and create chances/take wckets. As long as the batsman is in the crease and feels reltaively safe against a bowler, he's not going to be under any pressure.
Because there are many batsmen in the world who will become frustrated by their inability to score runs and thus play a wild shot or end up giving their wicket away. People aren't saying it's the be all and end all of taking wickets but if the batsman are scoring fluently and able to take runs where they like, then there is no pressure and it's more difficult to take wickets, unless as you said the bowler is bowling jaffas.
Obviously it comes far more into play in ODI's where (obviously) a team only has a limited amount of time to bat and they must make the most out of it but it is certainly the case in Tests as well. It might not be at the forefront of taking wickets, but it has to be there or all the ex-pro's wouldn't go on about it as well.
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Considering the situation has no place in an argument here. Let's take a look at the figures of the highest and lowest totals to ever be made in world cricket.
http://stats.espncricinfo.com/ci/content/records/283966.htm
Records | Test matches | Team records | Lowest innings totals | ESPN Cricinfo
Just on an overall basis, just by looking at the stats you can see there must be some difference. Most of the highest run totals have a run rate in the high 3's an over or low 4's. Whereas the majority of the lowest score totals, have run rates in the mid 1's to low 2's.