To nailshoote, et al: T1-11 Wood Siding Question

Re T1-11 wood house siding:
a. Are their different "quality" levels, or is the stuff HD sells pretty much it ? 5/8 thick the standard ?
b. For areas that are damaged on house, and need replacement:
Is it practical, or ever done, where a narrow, perhaps a foot wide, strip is replaced by ripping from a new panel, or is it always that a complete 4x8 foot section is always used in its entirety for any type of replacemnent or repair ?
c. This stuff still used (much) ?
Thanks, Bob
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