Construct 3 and Construct Animate are not Chrome only, it works in all major browser and even mobile/tablet devices. Chromebook support has been a major plus for us in the educational market.
Construct 2 was pay once, but we found after a few years sales really plateaued. Going to SaaS was a difficult transition for us, but it's worked out well and we now see year on year growth which gives us a lot more breathing room.
I think it's important to also recognise that pay once software just doesn't work as a model for a lot of countries around the world. As an example, for Construct 3 we charge the equivalent of ~$12 USD per year in Malawi which makes it a very affordable option, whereas a one-off price would have to be roughly quadruple that for it to be economical for us, and would likely put it out of reach of a lot of people who otherwise may of paid annually for it.
SaaS puts more onus on us to cater for our current paying customers, before with pay once our focus was weighted on acquiring new customers. To what extent this actually plays out is kind of tricky to put your finger on especially from where I'm sitting but there is certainly an element of this in our work.
I'm not going to pretend that SaaS is suitable for everyone and every product and I understand why people are adverse, but for us it's worked well and a lot of noisy predictions from some of our customer base about this being our downfall never played out. The transition to pay once to SaaS was a vulnerable time for our business and a very interesting one at that.