ULT is still strong if you know how to build properly.
What... her ult will also always be reduced by 40% by GW no matter what you build or what you do.
Also executioner is back, sure, but no one wants to add it to their build,
That is the problem, it is literally never built in plat or below. the only elo i saw it built (I would say... oberbuilt...) is high diamond and master+, it is often just rushed after ADC's first recall as a super cheap and no brainer way to win the lane. I am having it built against me in about 8 out of 10 games in ranked, about 7 of those games are enemy ADCs buying execall after first recall in lane. Multiple executioner's callings in enemy team are not rare occurances for me (and yes, I am usually the only one countered by GW in my team). I have had Illaoi (because her ADC did not, she said that herself), full tank Gnar and full tank Rek'sai build it (both Gnar and Rek were in the same game) against me. If you need proof just check my match history.
My main issue is only execall, it scales too well into late game for its cost, is so abusable with any AoE/multi target PhD abilities and leaves Soraka no chance for unreduced heals during any fight with that enemy with execall present. GW feels like appearing out of blue sky (it takes just scratch of e.g. Sivir's W, Cait's Q, Twitch's R to apply GW at full strength) and gives no windows of opportunity.
I would be fine with Ignite, Morellonomicon (the GW from that lasts 8 seconds for no reason at all though...) and even Kata's R (I thought riot wanted to remove GW from champs' abilites) but I just can not stand Execall.
If ppl actually started building execall her winrate would drop by like 3-4% no joke.