You can´t know that for sure, without playtesting it. i think every mechanic that could improve the game need and should be tested. If SV could make it work, it would be a great addition to the combat system for players with short weapons. A backward dash should not be a problem, but very useful, to avoid a hit if you are low damage and to get a punish. if a sidestep would fuck up the netcode, it need to get patched out. A mechanic that can improve the gameplay should always be tested,
even if not all mechanics will make it into the game, when it turns out, that they do not work too well, in a game with one server and some players with a higher ping. Maybe the sidestep is not working but the Dodge Backwards is working wihtout a problem, and might be a great addition. Who knows. All i know, is that i love to play a light armor guy with a dodge in other games. It make games such as Chivalery more fun and skillbased. The MAA was always squishy as hell, but you could make some plays, if you timed your dodges and hits correctly. Especially if you fought 2 Opponents. You could hit one guy, and dodge away, to avioid a hit from the second guy and stuff like that. in Mordhau you only had a backward dash and it made it much harder to fight more then 2-3 Opponents, compared to Chivalery. I know this can´t be compared to an MMO, but every good sword game need mechanics, that allow a good player to beat multiiple Opponents.
If a dodge would cost too much stamina, it would rarely be used PVP but could maybe be used in Pve, to avoid a knock back from a boss mob (If SV decide to add more mechanics such as a knowckdown charge) or other PVE Boss mechanics, to make PVE more of a challange. It is all about, how a mechanic get implemented and require some research, how such a mechanic could improve the game and about the requirements you need, to perform a specific move, that a mechanic makes sense and improve the game and not make it worse, becuase it can be abused or cause problems.
If a developer refuses to test new mechanics, it is always bad for the gaming experience.
That's why I'm happy when Henrick doesn't refuse to test out new ideas.
I also don't think a dodge mechanic shouldn´t be a high priority right now. First of all, the basic stuff has to work and we have to be given the opportunity to set the options as comfortably as possible. I am very happy that Henrick confirmed, that we will be able to bind the different block directions on different Keys.
For me the freedom in the keybinding options, is the most important thing at the moment.
https://mortalonline2.com/forums/threads/the-game-need-more-freedom-in-the-keybinding-options.867/