I feel like I should make my position more clear, so:
I started playing SWTOR for the first time back in 2015. Indeed, back then the story phase bosses were at times challenging and it was definitely possible to die if you weren't paying attention to what was happening during the fight. However most of those bosses were challenging but fair (there was but one exception I remember to this day - that colicoid boss on Balmorra in the Inquisitor storyline, that thing was definitely not fair and it was frustrating rather than challenging), so even if I died, I felt like it was not the boss who was OP but it was me who made a mistake and lost because of that. In the end I was able to beat all the bosses (except that colicoid) during my 3 playthroughs (Inquisitor, Warrior, Agent) at worst in my 2nd try. Those fights were challenging but also fun and exciting. I didn't mind that at all. Paying attention during the fight and making sure to avoid mistakes is definitely fun in my book.
At the same time I don't really mind if the story bosses/mobs are easy and fast to kill. If I'm able to one shot them, fine by me. This way I'm not getting into long fights and I can just continue with my story (which is the main thing I care about in this game). However I DO mind if bosses aren't challenging but they're also slow to die due to some artificial and fake "difficulty". I won't die no matter what (I don't remember falling below 70% HP even once), I'm going to win no matter what but it's going to take just more time than I'd like. I can take challenging and fun, I can take easy and fast but easy and slow is the worst possible option. I can get through the fights just by mashing my buttons blindly and that's definitely something I do not find fun. But since apparently the path they've taken, then at least allow me to one shot those freaking story mobs when I'm at a higher level. It's not a challenge anyway, it doesn't make a difference whether I kill them with one hit or a few more - it just makes the fights more boring and tedious. Since the class stories are my main focus, I don't really care about level shifting in general on planets and I get there were reasons to introduce it. However I do care about them in my story phases. I feel like they're present there just to make fights longer and more tedious for no particular reason other than to spend (or rather waste) more time on them.
Don't get me wrong, I freaking love this game and it has still A LOT of value for me since I'm only playing my 4th class story right now. However that one thing is a change for the worse in my book. That's all I'm trying to say