In the UK, the upgrade from 16GB to 32GB is £400 ($460). If you have the laptop for five years and presuming you are buying the laptop outright with no interest, the additional RAM will work out costing you 22 pence (25 cents) a day. For something as vital to both your professional life and hobbies as this laptop sounds, are you going to miss 22 pence a day?
Additionally, if you sell the laptop at the end of the five years or keep it for seven like your current computer, these daily costs will in actuality be even lower.