You and your brother and anyone else you play need to be careful in how much you let your army composition dictate what you consider to be a reasonable amount/types of terrain.
Particularly if you're employing a "skew list", i.e. large numbers of one type of unit such as monstrous creatures. A Nidzilla or Imperial Knight list would be an example of this. A skew list has significant advantages but it should come with its own disadvantages as well, such as ability to navigate and fight in terrain.
Whatever you think of the "monsters vs infantry on the top floor" issue, it is the rules, and helps offset some of the significant advantages of taking minimal infantry choices. If your brother is having trouble dealing with infantry in ruins, he should change his list, not change the table you fight on.
The absolute ideal would be to have someone else determine the table layout, and have a large pool of terrain from which to draw from so you don't need to be using the same stuff over and over again. If its becoming a real issue, find some system before you play that works such as alternating placing terrain pieces until a pre-determined maximum/minimum number have been reached.
From my own experience, people don't use enough LoS blockers. More terrain makes for better games that aren't over by turn 3
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