Difficult to use SIA miles for upgrade

I wanted to book an economy ticket to London and use my miles to upgrade to business class.

I had to buy an Economy Flexi ticket for $2,200 to be eligible for the upgrade. The upgrade was confusing. It depended on availability which differs from flight to flight. In some flights, the upgrade was for premium economy and not business class. The points required for the upgrade was also confusing.

To avoid the hassle, I bought a special ticket for $1,200 (return) and forgot about the upgrade. I will use the points for other flights.

I learned, after a confusing experience, that the best way to use my 60,000 miles is to convert it to use it to reduce the price of my ticket. The conversion rate is roughly $600 for 60,000 miles.