Zardnaar
Legend
I've never seen anything specific as to whether this surprised them or not. It really depends on whether they wanted anything like this in the game or not. We know they talked about walking back the system mastery game in this edition, but at the same time, they didn't want to push away (too hard) people who like that kind of thing. As maddening as it is for many (such as myself--who wants players to be choosing weapon-shield-feat combinations based on which flavor speaks to them most) for there to be some fairly straightforward simply-best choices, the difference between dual-wielding or longsword-and-shield fighter (who maxes their Str faster) compared to CBE+SS fighter is within the overall variation in power that the game has/had in 2014/seems to deem acceptable. It is entirely possible that the devs were saying, "well, maybe a little system mastery is acceptable" when designing the bonus-action-attack feats alongside the -5/+10 feats.
I think they thought the -5 part would matter. It's only -3 with archery style and the average AC in the MN is only 14.5 iirc.
And things like bless pretty much eliminate the penalty.
With XBE+ss iirc if you hit 50% after -50 is applied or more always take the -5.