To be fair, TP Link also had a similar issue. The Boomerang working the way it did actually did start to cause issues. Same with Ganondorf suddenly being really damn slow and all. Zelda and Sheik were the only two to be relatively the same at the time.
On the other hand, TP Link was much easier to adjust to, and Ganondorf became a fairly popular design due to feeling really fun and satisfying to use. But yeah, OOT and TP Link are still pretty different overall. I get the point behind it, but overall, the only Classic-style Link ultimately would be the Melee/64 designs(which are almost identical bar minor updates). Yes, some flocked to Young Link due to being more classic-style, but that's only because he really is as close to OOT Link as you can get. Besides literally being him. However, his playstyle is still different. This is why I get some want a different Link in general for the earlier adult moveset. That also said, the biggest change to Link is his grab game suddenly being different. It hasn't actually helped that much. The Remote Bombs are still notable too, but to a lesser degree(and actually weakens his viability). We don't know how much he'd take from TOTK, but it's unlikely he'll leave the BOTW stuff completely behind. That would be a lot more alienating, so adding some new skills to his current moveset with some minor updates has a fairly good chance of happening. The game isn't being skipped for content, after all(that said, that doesn't mean it's just going to suddenly get a massive amount of content and changes to characters either. You can count that happening only at one point in Smash history too, and that was also the sole time we got a cut, meaning it's a bit more unique than you'd think).
But anyway, while the idea of having more classic bombs is not impossible, starting to add some unique move commands is starting to miss the point of being, well, Link. He has a variety moveset, but it's always been simple but having unique stuff to allow for neat combos and thoughtful gameplay. It's not complicated as a moveset. Trying to fuse items together starts to get overboard with how he operates. Him using fused weapons in an aesthetic way on the other hand? Or even maybe a few of his attacks use a slightly different property to spice it up? These are a bit more reasonable. Suddenly Bomb Arrows? At that point, he starts to operate a tad too differently. As was spoken before, we don't want to alienate people. He is not alienating with the BOTW updates overall, though a tad awkward to adjust to at best. But overhauling his core style with complicated moves and commands is a completely different story. At that point, why not just give him Bomb Arrows as his new default B? A little spiced up at best. Then he keeps the Remote Bombs for a different variety, but it also evolves his game and makes up for having some new changes. There's bound to be better ways to use the new Fuse Mechanic than essentially turning him into a new character.
Remember; characters haven't gotten any updates that heavily complicates their moveset or completely changes how they function. While some are still big overhauls, the core has always been kept intact. I note Ganondorf as a great example of this going into Brawl, and then back into Ultimate. You still have the clearly same core moveset, but it has some differences that help change things up. Whether it's too much to adjust to for some(which is a fair take), it's quite clearly built off of the same core concept. It's also worth noting that sometimes a conceptual moveset may not be as hard defined as other ones. Clones in general are notable in that they are traditionally similar to their counterpart. This never changes. Meanwhile ones like Pit did get a pretty big overhaul going into 4, but like some, he was more seen as a "this kind of character". So their origins and design philosophies does have some relevance to why some get bigger changes than others. There's kind of no "specific way" to define it cause characters are pretty much all over the place. At most, no clone has deviated that much, despite getting updates. Like, you know Roy is still tied to Marth. And Lucina always will be. Just like Chrom will be tied strictly to Roy, etc. Characters not tied to others base-wise do appear to be given more freedom, basically.