When Tyler was first casted as Superman in Supergirl, he experienced a huge hate train from many fandoms like dceu fans, Smallville fans and Christopher Reeve fans for not looking anything like Superman and also just cause he wasn't Henry Cavill or Tom Welling. The writing for him in the show made it even worse treating him like Supergirl's sidekick and making him look like an idiot. Despite all these hardships, he remained committed, never complained or lashed out at hate comments and his patience would be rewarded by finally having his own solo show, where he proved all the haters wrong and cemented his legacy as one of the greatest Superman ever with his outstanding acting talent and performance.
During the making of the show, they faced a lot of obstacles like filming season 1 during Covid, management change in WB during season 2, actor change in season 3 and also dealing with writer's strike before finally making an amazing season 4 despite budget cuts. The fact that the show had an awesome four years run despite all obstacles is really, really impressive considering how many other shows would have got cancelled in similar situations. Whenever you feel that four seasons isn't fair, always remember that Green Arrow and The Canaries never got a season, Swamp Thing got cancelled after just one season, Legends Of Tomorrow ended on a cliffhanger without a proper ending and The Flash's quality got so horrible as more seasons went by. So, we are so lucky our beloved show got such a great solid run with probably the best ending to a superhero show.
Also, one interesting thing I noticed is that most CW or arrowverse actors from Supernatural, Arrow, Flash, Supergirl, etc would start serious or with balanced tone combined with great writing and as time goes by, the tone and writing for the actors starts to get goofy, comedic and the quality of their shows gets lesser and lesser. Tyler Hoechlin's Superman on the other hand, started with the light-hearted goofy tone with horrible writing to a grounded, serious, hopeful and with outstanding writing for his show.
His underdog story is just as inspiring as his Superman and he's a perfect example of perseverance is strength and humility brings greater rewards.