Not only a small screen by modern standards, but the hardware lacked the needed resolution. The marketing brochure claims a 10x10 dot matrix. That will be for the 80 column mode. That works out to respectable 800 pixel horizontally, barely sufficient 6x10 pixel in 132 column mode. There was even a double-high, double-width mode for easier reading ;-)

Interesting here perhaps is that even back then it was recognized, that for different situations, different display modes were of advantage.