I'm sick and tired of PL papers that present a novel language idea and then justify it with...a formal model...huh? This is a logical fallacy of the shaggy dog variety.David Barbour:
developing a new language is also nigh completely pointless unless there is something useful and interesting you can say about it. ...Matt Hellige:
Usage doesn't justify a design. Valid technical design seems to be a relatively minor factor in market success. ...
most attempts to achieve 'ease-of-use' and 'ergonomics' involve guidance by reasoned principles... a sort of Feng Shui for HCI (which holistically includes PL).
Programming languages are tools that require significant investment of time to learn to use well. To a large degree, their value is measured in terms of how valuable they are to the people who know them best.