That comes from teams believing they need that one missing piece. With Jax, it's a make or break year for Bortles.
Legion of boom lasted 3 years before Maxwell was traded. Rodgers good group of 5 WRs lasted 2 years, and then were gone. I'm having a hard time thinking of any other group of WRs or CBs that a NFL team builds around and wins. At that position, it's 1 break out year, 2-3 re-living the glory days, then FAs where there are more busts than success stories.
Cowboys Oline got immediate impact when they started building it, and won games for 3 years, and now entering their prime. Raiders did the same. Oline is needed before the QB. It wins games and has longevity and only needs time and coaching to build. It's a move that makes sense for the Bills. Taylor has flaws with his game that are not going to be fixed in a year. With OLB, WR or CB the Bills are just a farm club for the rest of the league, and in a few years we have nothing.
It doesn't come from that at all.
The simple fact is that skill position players get more money because they have greater value.
That Buffalo put together the best rushing attack in the NFL for 2 consecutive years with a line comprised of 2 street FAs, a mid round pick, a 2nd round LT, and a first rounder at center is a testament to what can be done scheme-wise.
Teams that prioritize OL are few and far between, and as we saw in the playoffs, they'll always lose to the teams that have a franchise QB.
Anyway, to the topic at hand: yes, the team could use an upgrade at RT, but investing heavily in a position that is routinely filled by late round picks seems like a terrible idea.
Case-in-point: the RTs that teams threw huge money at in FA were guys like Remmers and Wagner--late round picks.