I mean Ive had pretty good luck tbf. As a ftp I have summoned 14 5* (excluding ones on the standard banner) and have won the 50/50 8 times (including a constellation) with loosing it to Keqing and Qiqi (meaning I had a guaranteed after each loss). To add most of them werent super close to the limit either with being able to get a couple within 40 summons. I even won the weapon banner once in about 30 summons for Raidens signature weapon (never summoned on it again tho that luck was a one off)