I think that there is no cut and dried answer. Laziness appears to dramatically improve modularity, but it's unclear whether all of the tradeoffs are worth it. It's difficult to analyze the downsides still since (a) more research is needed and (b) a lot of it can be shrugged off as "weirdness", but it's clear that there are reasons to prefer strictness as well as to prefer laziness.

I've grown to be of the opinion that neither is best and that languages ought to be developed which allow free and clear choice between evaluation strategies throughout. Lazy defaults at the right times and clear strictness types might be a way forward, but it's hardly anything I have expertise in.