Don't believe what you hear, longer isn't always better
rofl that's why I never used my Safebloc when I first got it, I built "the ideal" sling for it which I reckoned was 3/4" polydyne and nearly 20' of it or over 15' at least, dead-eye, allowing virtually anything and with super-strength compared to TEC....its weight, and tying a long tail, made it so I never ever used it

Got some 3/4 tec to make the whoopie and now I use it which is nice because it's such great hardware, my last go-to was the 3-ring, 6' x-ring sling and that gives maybe 50% the friction the Bloc does, so for solo-rigging I can say use the Bloc as terminal and set some XL's right-beside and the friction is crazy also you can easily create a wider 'top' to the rigging line's path/arch by spreading them
Sometimes longer is better, though, with my favorite sling (I call it the snake lol) which is a 10' length of 3/4 polydyne that's got an XL on each end....I'm often in spreading canopies so its length lets me just hang each end through a different crotch and
bam it's like I just set 2 slings when it's really one, and the polydyne may only be a bit stronger
static than same-size TEC but it's
far more dynamic, I like to use it as my higher-point anchoring with my Safebloc in a lower, final position (when things just happen to line up perfectly lol, I mean "my optimal" or 'what I aim for') But the length inherently affects how far this "rig & ring" type sling can be spread in super convenient fashion, length is better here

(one of the ends has an "elevation canada" ring which is 10% fatter than regular XL's, too....sometime when I finally slip-up and buy more cordage/hardware, another XL elevation ring and Bloc, and 7/8 TEC & p.dyne, will be making some 1-and-done anchors!!)
When I set my blocks with a loopie or whoopie I try an snug it up tight but sometimes I get lazy and there is some siop, it still works fine.
When you say "it still works fine", you mean you don't notice difference if
snubbing loads that way? If running it that's fine but I'm also/primarily talking about snubbing a load, or you mean that even then the difference between 'optimal snug' and 'kinda slack' is still so small it's irrelevant minutiae? (apologies if the latter!! Am kinda working my way up with solo rigging, in terms of piece-size or rather in terms of peak-forces, bought a very complete/comprehensive (and super heavy-duty) rigging kit "to grow into" and finally getting lots of great opportunities to try more things in more ways, for a 'practice tree' I"m doing now I'm, ideally, going to take the top, snubbing it, and then directing/controlling it on a controlled-slideline system (by myself/from tree, have also been practicing angles-of and types-of cuts and 'fall techniques' for branches, but yeah I'm mostly interested in solo-rigging as I prefer being alone even if it means setting a ton of friction and taking largest pieces I reasonably can / working longer, I randomly have a free groundie tomorrow for a regular slideline job but that's not my practice-tree where, when using this whoopie a few days ago, was totally 'testing snugness' (was taking the tail and doing an extra wrap around the Bloc's spliced throat, as-if it'd protect/buffer it from the other end's eye or something

)