There are various points of view concerning economical purchases. The obvious point of view is electing for what is cheaper in the short term. At certain times within my long employment history, I purchased bargain footwear that wore out quickly. When I commented on my need to replace my shoes yet again, a work colleague pointed out the obvious--my economy shoes were not very economical. His shoes were somewhat pricey but were still going strong after multiple years of use. I realize that this is a weak analogy and not very applicable in a direct comparison with lenses but it does illustrate the advantage of taking a longer term view with purchases compared with a strictly short-term view.
I have purchased way too many Micro Four Thirds lenses! I started out with a good plan to match my Olympus E-P5 with a set of Pen Primes (12mm f/2, 17mm f/1.8, 25mm f/1.8, 45mm f/1.8 & 75mm f/1.8). That worked out very well since I wanted to put together a prime-based kit that would fit in the very compact Domke F-5XB bag. Unfortunately, my subsequent lens purchases were based more on curiosity and bargain-based impulses instead of a plan.
When I purchased the Olympus E-M5 Mk2, I should have paired it with the Olympus 12-40mm f/2.8 lens. Instead, I wasted money on lesser quality lenses that now sit on a shelf unused. Eventually, I did purchase the 12-40mm f/2.8 lens and keep it attached to my E-M1 Mk2. I no longer have the E-M5 Mk2. However, if I did, I wouldn't hesitate to pair it with the Olympus 12-45mm f/4 lens (which I now pair with the Pen-F).
I did purchase the Lumix 12-32mm lens along with its tiny companion 35-100mm lens (which I included with a camera that I sold and later repurchased to pair with my Pen E-PM2). Yes, I also purchased too many cameras (something that would also benefit from a do-over with 20/20 hindsight).
Jim