Yes. The distinguishing feature of planned obsolescence is that the customer doesn't know the real design lifespan of the product. Just require companies to declare that and the problem goes away. Looks like the EU already does: https://en.wikipedia.org/wiki/Planned_obsolescence#Regulatio...

Definitely. A key example is phones whose batteries cannot be replaced by the end-user (and end-user repairability in general). Forcing users to update their phone's OS to newer versions which require more power from the newer models is another example. Printer ink cartridges often contain chips whose only purpose is to disable the cartridge - even if it's still got plenty of ink - after a certain amount of time passes. Also consider video games which require an internet connection to play, but do all of the logic on the client - when the servers disappear, well, time to buy this year's game instead.

Legislation against this practice isn't unheard of, there are fines and jail time for it in France.