I wouldn't get another dog in my circumstances, as it wouldn't be fair.
Honestly though.... do people really think it's better for the dog to be rehomed if your circumstances change?
What, honestly, are people meant to do?
A change of circumstances and adapting best you can is one thing, choosing to get a dog knowing it will be left alone for long lengths of time daily is another.
Some dogs are ok left alone, some aren't and get very anxious. I've seen dogs seriously injure themselves trying to get out of the house when left alone.
You can't know what your dog will be like until you get one. Many rescue places don't regime to families where they'll be left alone all day so the OPs May go the puppy route.
A puppy needs introducing to being left alone over time and build up, if both adults are working full time and can't take the needed time to ensure toilet training and building up over weeks sometimes months to leaving alone for six plus hours daily then there's a very good chance the puppy will be stressed.
They can't know until they get a dog what it will be like and it's a risk I wouldn't take and is why OP is getting a bit of a hard time.
Circumstances change, you say yourself you wouldn't get a dog in your current circumstances, which is what the OP is considering.