Very true. Most of all because stamps required value for a letter change often and I always ended up with lots of old stamps which were not enough for a letter

Very true. Most of all because stamps required value for a letter change often and I always ended up with lots of old stamps which were not enough for a letter anymore, had to buy lots of stamps with very little value to complete, it was anarchy. (2012, 2016, 2019 and 2022 saw price increases for German post for example…)