Does the job teach you new skills or have a better title than your current FT?
I'll start with saying my voice may be a minority opinion, and I'm OK with that...
Honestly, if you can make similar or higher income for working less time why the hell wouldn't you???
Any person who thinks about it logically would realize that it is working efficiently to earn rescources, NOT necessarily harder, longer.
Free time is one of the most valuable assets you can have in this modern world IMO. Money without time to enjoy properly enjoy it is a waste, nor do shiny things money is blown on really add much meaning to it.
I think American work culture should shift away from the fallacy idea that if your not chained to a desk for 40-80 hrs slaving away you're not productive, worth less, ect. So much time is wasted in pointless meetings, and drudgery of inefficiency, that could likely be much more efficient if people were paid for the job done. A 40 hour work day might be made working more efficient down to 30. But yet, it is the de rigueur to be "first one in, last one out". You're tagged as lazy if you're not doing it. Might be better off to act busy to fill in the gaps like your other office drones. It's almost as if work culture holds it against you for being efficient instead of rewards. Self-made businesses are different.
Most people don't realize that work is intended to gain resources to do what you enjoy. However, modern work culture instead tries to tell people that their self-worth and identity should be tied to the job they have and how much money they're making. I think that's sad. Gone are holidays, paid time off, sick leave and a general flexibility of employment. If you're not working harder and longer, you're no good. This is why ass kissers tend to get much further.
Work is important as a way to means, not means to the end. Too many people get that one backwards.
If you can have a comfortable life with less hours, why fk not? I think more opportunities should be given to those who'd like to work less.