I agree with Tagamanila here.
I'm currently learning Tagalog, and I agree that it's important to learn Tagalog without a massive amount of Taglish in order to understand more complex literature and talk to people outside the largest Philippines cities (e.g. Manila) where Taglish seems to be used more. If you do this though, you can find that you may start finding words and learning words that are uncommon or obsolete now, like I have been. This is referred to as "deep Tagalog".
Taglish is something that can be picked up naturally or you could make an effort to figure out the pattern to it, as there seems to be a natural but kinda hard to explain pattern to it (or at least for me it's hard to explain). At the start, I agree that you should be using Taglish to fill in the gaps so you don't feel too demotivated. It's one of the best things from the perspective of a Tagalog learner - if you don't know the word in Tagalog, just use the English one!
In my opinion, you should try to figure it out if you're at the start, because it's a nice crutch to use in the beginning. However, when you become an intermediate learner, don't become too attached to it! You'll likely stall your progress if you do.