I often have IM QS & TW on cooldown while SAsc'ing, and in my earlier stages, I would even have TS as a 4th on cooldown, b/c that eliminated the need to spend actual IM powers to clear levels while still keeping the clear time quick-ish
For me personally, epic TS is good enough in many cases and easy and reliable to get. I am only using TS on HRise and EH anyways, so i considered having a precious takeover slot for just 2 maps is overkill.
Fair enough. I only use on hardened levels recently but that's been through choice to see how long they take. The extra troops for legend is helpful sometimes