COVID-19 has caused many large-caps' stocks to tumble like Spirit, Husky Energy ($2.75). Why don't they reverse stock split to uplift their share prices? Here are some benefits of unsplitting:
A high stock price can make the company look prestigious. E.g. A company trading at $1,000 per share will be perceived as more valuable even though the firm's market capitalization may be the same as a company whose shares trade at $50.
Share values mustn't fall too low! There have been cases where companies have split shares only to see the stock market dive, pushing shares below $10. Psychologically, this may turn off some shareholders, and in extreme cases, share prices may be too low for a company to be listed on an exchange. Companies will avoid splitting to protect themselves from this possibility. Doubtless large caps wouldn't fancy themselves dropping to being a penny stock!