Question on M&I guide - Accrual vs Cash Accounting

I've been reviewing the M&A 400 investment banking questions guide, and came across the question:

"How is GAAP accounting different from tax accounting?" and the answer is:

"1. GAAP is accrual-based but tax is cash-based. 2. GAAP uses straight-line depreciation or a few other methods whereas tax accounting is different (accelerated depreciation). 3. GAAP is more complex and more accurately tracks assets/liabilities whereas tax accounting is only concerned with revenue/expenses in the current period and what income tax you owe. "

On 1 and 2, I thought this wasn't always the case and was something that companies would choose? Can someone explain this answer to me?

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