I can think of one UK show that has had 100% turnover in lead characters, in fact. . . .
Which pretty much killed my interest in it, if it's the one in your icon ... (Though this also had to do with certain writing choices in later seasons.)
I'm on board with a certain amount of character turnover -- the alternative is often a show getting very stale, and I've quit watching a couple of shows because they took the characters everywhere they could take them and then just ... kept going. Some character turnover would have been welcome! But past a certain point, it just gets to where you don't want to get attached to anybody. That was essentially what happened to me with Lost -- a lot of people complain about meandering writing, but for me, it was more to do with the fact that I didn't dare get invested in any of the characters.
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Which pretty much killed my interest in it, if it's the one in your icon ... (Though this also had to do with certain writing choices in later seasons.)
I'm on board with a certain amount of character turnover -- the alternative is often a show getting very stale, and I've quit watching a couple of shows because they took the characters everywhere they could take them and then just ... kept going. Some character turnover would have been welcome! But past a certain point, it just gets to where you don't want to get attached to anybody. That was essentially what happened to me with Lost -- a lot of people complain about meandering writing, but for me, it was more to do with the fact that I didn't dare get invested in any of the characters.