My friends and I went on a tour to a football stadium recently and a friend from Austria who couldn't come to the trip messaged us to say
Hätte zu gerne die Stadion-Tour gemacht
Now, I was thinking, as there was no personal pronoun for hätte i.e. "ich", similar to Spanish, is there a need for personal pronouns in conversational German all the time?
Is it valid to sometimes not say the personal pronouns preceding a conjugated verb?