Warner's best wrestling is on the mat. Now, that doesn't mean he scores a bunch on the mat, but he can ride enough to get riding time and rarely is down long enough for it to become a factor against him. He is good enough here that I don't see him losing a match due to his mat wrestling.
The simple truth is, he is a VERY fundamental wrestler, but he isn't very fast and his attacks have been well scouted. As such his opponents rarely attack from space(except Bastida who actually has world level experience and speed to clear before Warner could counter), negating his go behinds and keep their hips back in the ties, negating his go to leg attacks.
The above is where Warner's stamina and keeping his head come into play. When the stamina is there the confidence matches it and he doesn't force positions late. When it isn't you see him drop some odd matches during the regular season.
I get that he doesn't score a bunch and that is hard for many to watch, but let's not forget, he doesn't get scored on much either. Other than the big move Reenan hit early, Myles Amine was the only one to score 5 points against him all last season and Penola was the only other one to score 4 or more. Hell, he only gave up more than 4 points twice in 2020 and that was when he had his other Midland's meltdown losing to Aiello 9-7 in OT and to Bruckin 10-5. Even Kollin Moore only scored 5 points against him the year before.
I guess it comes down to if you are a glass half full or glass half empty kind of a guy. Yes, his style is prone to close scores. However, that doesn't always mean the matches are that close and you may think it means he is always in danger of losing, but it also means he was only 1 takedown away from beating Ferrari and Amine...