I think you can miss seeing a peak player without unrealistically thinking that player could be peak again.If he could play at the level he did 5 years ago, I would miss him. Just like I would miss Thiem if he played at the level he did 1-2 years ago. Nothing more fun than watching them outhitting everyone else from the baseline. Sadly, I don’t think it it is realistic anymore for Wawrinka.
I did specify that its outside of his top matches, i'm not deluded enough to deny he was outstanding in those few memorable matches but he was a nobody before his few title runs and even during and after he slipped back into average territory in terms of watchable tennis. For me a watchable player is someone you enjoy watching all year round and he wasn't that player for me.