You're right with this intention, because most important is our workflow without obstacles...
If you are venturesome then take the MB 2018 and keep it away from any dust and dirt – but be aware there have been a lot of failures
not caused by dirt (reason has not been cleared up to now, maybe signal/contact problems). If you decide to buy, then wait anyway, because a chip update is probably coming soon (but when?).
We bought in August the Mac Book Air 2017 i7 with 512GB, because we realized that Apple will keep the butterfly keyboard 3rd gen. (too slow for a quick redesign and too obvious with big consequences to the other MB and MBP 2018).
Works perfect with a soft keyboard and besides a good pricing!
It's a bit heavier than MB but no problems in sight
The turn is on Apple to make a redesign on the whole laptop row – when? Depends on how serious they are...