adventurers in every story often described as freedom, so this plot is too forced, why they can't choose their own party member? what will the guild do if the forced partner lead them to disaster?
I feel like you're only focusing on happier side of those stories. A lot of other stories have adventurer guilds emphasize freedom... But a lot of them they still have requirements that you only work on the guild posted quests, that there can be mandatory quests, that you need to do a certain amount of quests every so often in order to keep your license, that the guild can be corrupt, that the guild has to worry about politics or about making ends meet... That sounds a lot like actual guilds where you followed their rules or else you're kicked out and banned from working in the industry.
That said, it would be a pretty bad compatibility matching process if the people it says are high matches are in fact disasters. The absurdly high precision they have on that sheet for their compatibility seems like it has to be magic or some super algorithm, so I'm inclined to think that whatever it was is pretty much correct. Under that notion, the guild seems a bit reasonable to want to force this grouping up. From the guild's perspective, if the two grouped up they'd be able to do more together, take on harder stuff, help work on quests that the guild wants addressed that they previously could not... And if they don't group up the guild just has two disobedient meh adventurers. I know which one I'd pick.