None of my kids liked spicy food. Everyone is different. We didn't do the whole "one veggie at a time per week" thing because it would take forever to get them acclimated to all of the different veggies we eat.
IMHO, that approach is only necessary if your kid has sensitivities. If they've never shown allergies to anything you can almost certainly get away with feeding them a varied diet and only backing off if you see signs of trouble.
That IMHO applies to the rest of this post by the way.
Lots of baby advice is written by people who are caring for really sick babies. They see that totally puffed up kid in their office and go "if only they had waited another year on the peanut butter!" That's also why you see advice about how to maintain a hospital level of cleanliness at home--because immune-compromised kids need that. It's not good advice for a normal healthy kid though and research suggests it may make allergies worse.
Also remember that when you see a statistic like "10 children die each year from having a blanket in their crib, naked cribs only!" it's important to remember that many (often all) of those 10 kids were sick and were unlikely to make it past 1 anyway. And even if it were healthy kids, the odds are really low that it would affect you and the alternative of having a cold kid is not good. Or you can do those sleeping bag things and have a hot kid instead.
As a parent, you learn pretty early on that a lot of advice you're getting is dubious at best. A person that tried to follow all of it would be driven insane in short order. IMHO the best parents are the ones that filter said advice most strongly and do what they think is best--but I only say this because it is my personal philosophy.