Good topic.
I don’t know of any spiritual writer who went so far as to say if you don’t have dryness you’re not doing it right.
I think it may be that all spiritual writers tend to pray a lot, likely more than the average person here…say, an hour or more a day, every day. Perhaps not in one hour increments, but likely in blocks of half hours.
This is serious prayer…day in, day out. This isn’t “vocal prayers” (the Rosary)…this is contemplative personal prayer, sometimes called mental prayer. Conversation with God.
And they recognize that not every day is going to be an easy day to pray…but they remember that the reason we pray isn’t for the feeling we get…but instead for the love of God…so when things get a bit dry, or cold, or difficult…they keep praying nonetheless out of love for code.
Dryness of course is different from lukewarmness. Lukewarmness is more dangerous to the interior life.
Prayer does take work…takes preparation, take order, finding content to bring to prayer, attention, abandonment, trust, pushing aside our feelings at many times.