Correct, I haven't.
You're also correct in sentiment that most people vote for a party. Unfortunately, you're wrong in fact. At UK General election people vote for the candidate, a person, not merely the party they represent. You'll know this because when the read out the results, they say for example...
"Keir Starmer, The Labour Party candidate, 36,641... the person is named before the party. Now, that might not matter to lots of people on here, I might even be in a minority of one here, but it does matter to me.
This person, even if I haven't voted for them, is my representative. They are directly, personally, accountable to me. If I like what they do, I'll vote for them next time; if I don't, I'll vote for someone else.
Who wins, and whether I'm successful in having the candidate I chose elected doesn't matter to me one bit. The direct, personal bit, does matter to me.
TBH I get the feeling people are either not reading or being deliberately obtuse. This stuff is really not hard.